Specifying if MPI was initialized on the server.

This changes lets the client know if the server was initialized
with MPI. It also enables allowing the XML proxy definition to
specify whether it relies on MPI in order to be instantiated.

Change-Id: I335ed3dc3dbaa40acdb1c7fd758ebc6a404e80c2
Merge topic '14314_servermanager_mpi_initialized' into next

87ce780 Specifying if MPI was initialized on the server.