sshmem_ucx: add owner.txt

Signed-off-by: Yossi Itigin <yosefe@mellanox.com>

oshmem/mca/sshmem/ucx/owner.txt

@@ -0,0 +1,7 @@
+#
+# owner/status file
+# owner: institution that is responsible for this package
+# status: e.g. active, maintenance, unmaintained
+#
+owner: MELLANOX
+status: active