vtkInitializationHelper was using vtkSMUtilities which is in
vtkPVServerManagerRendering. That added an unnecessary dependency on rendering
which caused failure in Catalyst builds withoout rendering. Moving the
ListAttachedMonitors() method from vtkSMUtilities to vtkInitializationHelper to
overcome this issue.

Change-Id: Ife732871fd70709f48c132ed13c0b6dc241baf0d