Add liveness and readiness probes

[tolusha]

Signed-off-by: Anatolii Bazko abazko@redhat.com

Reference issue

https://issues.redhat.com/browse/CRW-683
https://issues.redhat.com/browse/CRW-916

What does this PR do

• add liveness and readiness probes for operator
• add liveness probe for keycloak and postgres containers

[tolusha]

/retest

[tolusha]

/retest

[openshift-merge-robot]

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

Test name	Commit	Details	Rerun command
ci/prow/v7-che-operator-single-host-nightly-deployment	0ed6d7e	link	/test v7-che-operator-single-host-nightly-deployment
ci/prow/v6-che-operator-single-host-nightly-deployment	0ed6d7e	link	/test v6-che-operator-single-host-nightly-deployment
ci/prow/v7-che-operator-olm-nightly-deployment	0ed6d7e	link	/test v7-che-operator-olm-nightly-deployment
ci/prow/v6-che-operator-olm-nightly-deployment	0ed6d7e	link	/test v6-che-operator-olm-nightly-deployment

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[tolusha]

OpenShift tests fail due to fact that it tries to use the quay.io/eclipse/che-operator:nightly image where readiness and liveness probes aren't added.

[tolusha]

Tested locally on OpenShift, it works fine.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mmorhun, sleshchenko, tolusha
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