Add missing condition in amphora controller when octavia-api is not ready

[gthiemonge]

When the octavia-api service is not ready or not available, the flavor creation fails, it triggers a RequeueAfter 60 sec without any explanations (condition or logs)
Add a condition error to indicate the cause of the wait/failure.

[openshift-ci]

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[beagles]

/lgtm

[openshift-merge-robot]

PR needs rebase.

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[openshift-ci]

@gthiemonge: The following tests 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/functional	391ed39	link	true	/test functional
ci/prow/precommit-check	391ed39	link	true	/test precommit-check
ci/prow/octavia-operator-build-deploy-kuttl	391ed39	link	true	/test octavia-operator-build-deploy-kuttl

Full PR test history. Your PR dashboard.

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[beagles]

Is it time to close this PR ? :)