openstack: change cloud name into survey.Select

[celebdor]

This patch uses gophercloud/utils to read the clouds.yaml and
present the user with a select list of the clouds that they have
configured.

Signed-off-by: Antoni Segura Puimedon [email protected]

[openshift-ci-robot]

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[openshift-ci-robot]

@celebdor: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/unit	5e35e8d	link	/test unit
ci/prow/tf-lint	5e35e8d	link	/test tf-lint
ci/prow/e2e-aws	5e35e8d	link	/test e2e-aws
ci/prow/e2e-libvirt	5e35e8d	link	/test e2e-libvirt
ci/prow/images	5e35e8d	link	/test images
ci/prow/govet	5e35e8d	link	/test govet

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[celebdor]

closing since #611 covers it