openstack: add an image with openstack clients for openstack-e2e

[trown]

Adds optional openstack-installer like the libvirt-installer that will be used for testing against openstack.

requires: openshift/installer#1466

/cc @wking

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci-robot]

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

Test name	Commit	Details	Rerun command
ci/rehearse/openshift/installer/master/e2e-libvirt	f351842	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-openstack	f351842	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-aws	f351842	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-rhel-scaleup	f351842	link	/test pj-rehearse
ci/prow/pj-rehearse	f351842	link	/test pj-rehearse

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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[trown]

I included this in #3236