Fix apiversions base URLs

[jtopjian]

For #1529

This commit updates the apiversions packages to account for a variety of base URLs which have been known to exist in the Keystone catalog: https://github.com/gophercloud/gophercloud/blob/master/openstack/utils/testing/base_endpoint_test.go

These packages should also be housed under a versionless directory. For example, networking/v2/apiversions should be networking/apiversions since it should be possible to use this package to retrieve the API versions for all major versions.

However, there is a catch: services such as Block Storage changed the format of the API results a while back. this is why blockstorage/v1/apiversions exists. I fell down a rabbit hole looking into this a while back (#458). I haven't reviewed all of these packages to determine if there are other occurrences like this, so for now, the packages will stay where they are.

[jtopjian]

@openstacker @MaysaMacedo: Total coincidence that you both contributed an apiversions package shortly before I discovered this bug. I recommend updating your application's Gophercloud library once this is merged.

It's very possible that you won't see this bug in environments that you have access to, but I'm confident that you will eventually get reports of failures. The following test has a list for all supported URL formats once this is merged: https://github.com/gophercloud/gophercloud/blob/master/openstack/utils/testing/base_endpoint_test.go

[theopenlab-ci]

Build failed.

• gophercloud-unittest : SUCCESS in 2m 51s
• gophercloud-acceptance-test : FAILURE in 1h 31m 55s
• gophercloud-acceptance-test-ironic : SUCCESS in 32m 07s

[theopenlab-ci]

Build succeeded.

• gophercloud-unittest : SUCCESS in 2m 42s
• gophercloud-acceptance-test : SUCCESS in 2h 12m 04s
• gophercloud-acceptance-test-ironic : SUCCESS in 34m 14s

[ozerovandrei]

github.com/gophercloud/gophercloud/openstack/orchestration/v1/apiversions
# github.com/gophercloud/gophercloud/openstack/orchestration/v1/apiversions
openstack/orchestration/v1/apiversions/requests.go:10:32: undefined: apiVersionsURL

[MaysaMacedo]

@jtopjian okay, thanks for letting us know.

[coveralls]

Coverage increased (+0.01%) to 76.589% when pulling 9891fd2 on jtopjian:apiversions-base-urls into c923f33 on gophercloud:master.

[jtopjian]

@ozerovandrei whoops - ok, should be good to go once OpenLab finishes.

[theopenlab-ci]

Build succeeded.

• gophercloud-unittest : SUCCESS in 2m 43s
• gophercloud-acceptance-test : SUCCESS in 1h 32m 09s
• gophercloud-acceptance-test-ironic : SUCCESS in 34m 56s

[ozerovandrei]

Looks good!

[jtopjian]

@ozerovandrei Thanks!