APIManager CR status field implementing Available condition

A new condition in APIManager's Status section named Available.

The operator defines the Available condition to true when ALL of the following scenarios are true:

• All expected DeploymentConfigs to be deployed exist and have the Available condition set to true
• All 3scale default OpenShift routes exist and have the Admitted condition set to true. The default routes are:
  • Master route
  • Backend Listener route
  • Default tenant admin route, developer route, APIcast staging and production routes beloinging to the default tenant

the user can now wait on apimanager CR condition

oc wait --for=condition=available --timeout=-1s apimanager1