A JUnit Plugin test runner client for Unit Test View bundle.

Change-Id: I50da75952c84c02a878b72e452fbd9574b8b6561
Signed-off-by: Victor Rubezhny <vrubezhny@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.ui/+/179677
Tested-by: PDE Bot <pde-bot@eclipse.org>
Tested-by: Vikas Chandra <Vikas.Chandra@in.ibm.com>
Reviewed-by: Vikas Chandra <Vikas.Chandra@in.ibm.com>