Operations Center Parent 3.0.42

This adds support for the triggerRemoteJob step within High Availability (HA) controllers.

This changes the transport used by the Remote Directory API to use HTTP instead of Remoting, in order to provide compatibility with High Availability (HA) controllers. This can be turned off using -Dcom.cloudbees.opscenter.client.plugin.RemoteDirectoryServiceImpl.useHttp=false in case of a compatibility issue.