Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to 47c7a904b9a764a2159066bff311f204fd18ce0d
  - Fix vnf-topology-assign async

    Updated vnf-topology-operation and vf-module-topolopy-operation
    not to call assign-async directly.
    Updated vnf-topology-operation-async and vf-module-topology-operation-async
    to call assign-async instead of assign.

    Change-Id: I16900ecb2126d2fe7fc3e1dfea351345272c275f
    Issue-ID: SDNC-961
    Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>

diff --git a/docs/submodules/sdnc/oam.git b/docs/submodules/sdnc/oam.git
index b6b8c36..47c7a90 160000 (submodule)
--- a/docs/submodules/sdnc/oam.git
+++ b/docs/submodules/sdnc/oam.git
@@ -1 +1 @@
-Subproject commit b6b8c365120e9f5e8bf3105a9acc6e2e38b2f57c
+Subproject commit 47c7a904b9a764a2159066bff311f204fd18ce0d