Upgrade gophercloud to v0.4.0

[jsen-]

Resolves issue with date parsing in Ocata. See #485 for more details

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #485

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

NONE

[k8s-ci-robot]

Hi @jsen-. Thanks for your PR.

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[sbueringer]

/ok-to-test
/approve
/lgtm

[sbueringer]

/ok-to-test
/assign

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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