System-X: Unify methods used for connection to the services

[avano]

There is no rule for creating system-x services when it comes to connection details, so each system-x service uses different method names for the common connection options (host, port).

there are inClusterHostname and externalHostname methods for openshift deployments, but those are not particular used for anything and are used only internally to distinguish between where the integration is connecting to and where the client is connecting to and there is no standard for local deployments, so it means that the common usecase is to create a host method, that returns externalHostname.

We should create:

• a common set of methods (probably host and port)
• something like connectionString, for example tcp://host():port()
• get rid of inClusterHostname (would be handled in connectionString method)
• keep externalHostname