Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to b4f2903673c98cb12c99760c08a072340bfcfc08
  - Fix SDWAN DG activate in SDNC startup

    1. SDWAN newly add vf-module-topology-operation DGs
       are added in graph.versions to activate during
       SDNC startup
    2. Fixed SDWAN site and wan-port delete DGs by
       calling right DG to get parameters.

    Change-Id: I34fa321e325d92b2a471bc9cd8ae499990ae37b8
    Issue-ID: SDNC-659
    Signed-off-by: Prakash.E <prakash.e@huawei.com>

diff --git a/docs/submodules/sdnc/oam.git b/docs/submodules/sdnc/oam.git
index 14a1448..b4f2903 160000 (submodule)
--- a/docs/submodules/sdnc/oam.git
+++ b/docs/submodules/sdnc/oam.git
@@ -1 +1 @@
-Subproject commit 14a144870accfaf046e2b874cd6f519ecf6a7ae9
+Subproject commit b4f2903673c98cb12c99760c08a072340bfcfc08