Add support for C5 instance family

[shamil]

AWS released 5th generation of Compute oriented EC2 series. This PR adds support for them.

[KashifSaadat]

LGTM, thanks for the PR!

[KashifSaadat]

Just need to fmt the machine_types.go file:

hack/verify-gofmt.sh
!!! 'gofmt -s -w' needs to be run on the following files: 
upup/pkg/fi/cloudup/awsup/machine_types.go

/ok-to-test

[chrislovecnm]

Fixes: #3788

[barnybug]

@shamil out of interest, what base image are you using on c5 instances? The k8s-1.7-debian-jessie lacks ENA support, and the stock Ubuntu image networking seemed unreliable.

[shamil]

@barnybug we use C5 family in our test cluster. For that purpose we created our own AMI based on k8s-1.7-debian-jessie-amd64-hvm-ebs-2017-07-28 image.

I followed the official guide for adding ena support: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-ena.html

here is the output of the ethtool command

root@packer-test:~# uname -svr && ethtool -i eth0
Linux 4.4.78-k8s #1 SMP Fri Jul 28 01:28:39 UTC 2017
driver: ena
version: 1.3.0g
firmware-version: 
bus-info: 0000:00:05.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no

[shamil]

/retest

[felipejfc]

I guess that for this to be merged we should also change kops to use an image with ENA enabled when using c5 family.

#3788

[barnybug]

@shamil thanks for the info. In the end we used the coreos pre-built images which support ena (https://coreos.com/dist/aws/aws-stable.json).

[justinsb]

Awesome - thanks @shamil !

/lgtm

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[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[shamil]

/retest

[shamil]

e2e failing, not sure it's because of this PR. I'll do retry one more time ...
/retest

[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue.