added pmix unit test to tarball

orte/test/mpi/Makefile.include

@@ -53,6 +53,7 @@ EXTRA_DIST += \
         test/mpi/ziatest.c \
         test/mpi/ziaprobe.c \
         test/mpi/singleton_client_server.c \
-	test/mpi/spawn_tree.c \
+        test/mpi/spawn_tree.c \
-	test/mpi/info_spawn.c
+        test/mpi/info_spawn.c \
+		test/mpi/pmix.c