MPI doesn't support multiple inits

examples/Makefile.am

@@ -157,8 +157,10 @@ examplebin_PROGRAMS 	+=	$(STARPU_EXAMPLES)
 
 TESTS			=	$(STARPU_EXAMPLES)
 
+if !STARPU_USE_MPI_MASTER_SLAVE
 TESTS			+=	scheduler/schedulers.sh
 TESTS			+=	scheduler/schedulers_context.sh
+endif
 
 if STARPU_HAVE_WINDOWS
 check_PROGRAMS		=	$(STARPU_EXAMPLES)