Stop creating admin endpoint

[kajinamit]

keystone-operator no longer creates admin endpoint[1]. This follows that and removing admin endpoint.

[1] openstack-k8s-operators/keystone-operator#175

[openshift-ci]

@kajinamit: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/octavia-operator-build-deploy-kuttl	921a042	link	false	/test octavia-operator-build-deploy-kuttl

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[beagles]

Thanks Takashi!

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: beagles, kajinamit

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