Provision keycloak once a keycloak custom resource is created

[JameelB]

Description

Implement the provision of a Keycloak instance based on the definition of the Keycloak custom resource. A Keycloak instance and an admin user for that instance should be created. A reference to the admin credential is added to the Keycloak custom resource as well as the service instance id.

Progress

• [x] Provision Keycloak when a Keycloak custom resource is created.
• [x] Create a secret in the same namespace for the admin credentials and add a reference of this to the Keycloak CR.
• [x] Add a reference of the Keycloak service instance to the Keycloak CR.
• [x] Set phase to complete and status ready to true once Keycloak has successfully provisioned.

Additional Notes

Related JIRA Ticket - https://issues.jboss.org/browse/AEROGEAR-7683

Verification Steps

1. Create a Keycloak custom resource in the same namespace that the operator is deployed in.
2. Keycloak should start provisioning in that namespace.
3. A secret keycloak-admin-cred-<hash> should be created within the same namespace. This should have the following properties:

   ADMIN_USERNAME: admin
   ADMIN_PASSWORD: <generated-password>

4. The Keycloak custom resource should have status.phase: provisioning and the following properties added to its Spec:

   Spec:
   adminCredentials: <keycloak-admin-cred-ref>
   instanceID: <keycloak-service-instance-id>
   ...

5. Once provision is complete, the Keycloak custom resource should have status.phase: complete
6. Verify that you can login to the Keycloak administration console with the credentials provided in the keycloak-admin-cred-<hash> secret.

[JameelB]

ping @dimitraz

[JameelB]

Closing as these changes are included in https://github.com/aerogear/keycloak-operator/pull/9