add gRPC reflection support for seldon-core-executor and python wrapper

[CatTail]

What this PR does / why we need it:

Enable gRPC reflection for Go seldon-core-executor and the python wrapper, with gRPC reflection we can inspect server APIs easily, for example with grpcurl,

$ grpcurl -plaintext localhost:8000 list
grpc.reflection.v1alpha.ServerReflection
seldon.protos.Seldon

$ grpcurl -plaintext localhost:8000 list seldon.protos.Seldon
seldon.protos.Seldon.GraphMetadata
seldon.protos.Seldon.ModelMetadata
seldon.protos.Seldon.Predict
seldon.protos.Seldon.SendFeedback

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

add gRPC reflection support for seldon-core-executor and python wrapper

[seldondev]

Hi @CatTail. Thanks for your PR.

I'm waiting for a SeldonIO member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[CatTail]

/assign @jklaise

[CatTail]

Hi @jklaise can you help to take a look at this PR?

[ukclivecox]

/ok-to-test

[ukclivecox]

/test integration

[ukclivecox]

/approve

[seldondev]

Wed Sep 9 06:32:54 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/1.log

impatient try
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[seldondev]

Wed Sep 9 06:33:04 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/2.log

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[seldondev]

Wed Sep 9 06:33:41 UTC 2020
The logs for [integration] [3] will show after the pipeline context has finished.
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jx get build logs SeldonIO/seldon-core/PR-2395 --build=3

[ukclivecox]

@CatTail you need to run make fmt in the python folder

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cliveseldon

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• OWNERS [cliveseldon]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[seldondev]

Wed Sep 9 07:13:53 UTC 2020
The logs for [lint] [5] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/5.log

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jx get build logs SeldonIO/seldon-core/PR-2395 --build=5

[seldondev]

Wed Sep 9 07:13:53 UTC 2020
The logs for [pr-build] [4] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2395 --build=4

[ukclivecox]

/test lint

[seldondev]

Wed Sep 9 07:29:18 UTC 2020
The logs for [lint] [6] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2395 --build=6

[ukclivecox]

Can you rebase from master as it seems to be failing on new licenses?

[seldondev]

Wed Sep 9 08:38:30 UTC 2020
The logs for [pr-build] [7] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/7.log

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jx get build logs SeldonIO/seldon-core/PR-2395 --build=7

[seldondev]

Wed Sep 9 08:38:36 UTC 2020
The logs for [lint] [8] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/8.log

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jx get build logs SeldonIO/seldon-core/PR-2395 --build=8

[seldondev]

Wed Sep 9 09:19:14 UTC 2020
The logs for [lint] [10] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/10.log

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jx get build logs SeldonIO/seldon-core/PR-2395 --build=10

[seldondev]

Wed Sep 9 09:19:20 UTC 2020
The logs for [pr-build] [9] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/9.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2395 --build=9

[CatTail]

@cliveseldon looks like the lint failed due to license change, should I commit these license changes in this PR?

[axsaucedo]

@CatTail apologies for the delayed response, seems this may have slipped - this would be quite a useful addition to merge this. Would you be able to rebase from master and resolve conflicts? If you wouldn't be able let me know and we can help adding some of the changes. Thanks @CatTail !

[axsaucedo]

@CatTail just following up with the above, let me know, otherwise happy to rebase and do the changes

[CatTail]

@axsaucedo sorry for the late reply, I just update this PR, can you help to review it again.

[seldondev]

Wed Nov 25 13:31:36 UTC 2020
The logs for [pr-build] [11] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/11.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2395 --build=11

[seldondev]

Wed Nov 25 13:31:46 UTC 2020
The logs for [lint] [12] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/12.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2395 --build=12

[seldondev]

@CatTail: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
integration	788dea3	link	/test integration

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the jenkins-x/lighthouse repository. I understand the commands that are listed here.

[seldondev]

Wed Nov 25 14:28:59 UTC 2020
The logs for [pr-build] [13] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/13.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2395 --build=13

[seldondev]

Wed Nov 25 14:29:11 UTC 2020
The logs for [lint] [14] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2395/14.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2395 --build=14

[axsaucedo]

Thank you @CatTail !