Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to 6493900ed7a55ff00b2f31f8802f30f54bf335ae
  - DG'S added for MDONS use case
    
    Change-Id: Ie9570b9be519e54d43b547bcfbffc16d12b16123
    Issue-ID: SDNC-928
    Signed-off-by: Mehreen Kaleem <mehreen.kaleem@us.fujitsu.com>
    
diff --git a/docs/submodules/sdnc/oam.git b/docs/submodules/sdnc/oam.git
index 2627562..6493900 160000
--- a/docs/submodules/sdnc/oam.git
+++ b/docs/submodules/sdnc/oam.git
@@ -1 +1 @@
-Subproject commit 2627562e601e7a07865af79b9ab5acb77c1d6759
+Subproject commit 6493900ed7a55ff00b2f31f8802f30f54bf335ae