Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 2a7d8aac072fc47beedd3eaebaefe88aaa7860ee
  - Merge "Change to use OAM IPAddress"
  - Change to use OAM IPAddress
    
    Change to use ipaddress-v4/6-oam for the config deploy
    Add more assertions to the integration test
    
    Issue-ID: SO-1506
    Change-Id: I5ba45b055569f90f91308b6e9d4bd85a1d4e99fe
    Signed-off-by: eeginux <henry.xie@est.tech>
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 1256526..2a7d8aa 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 12565266faef74572cec51e01bd7f6ad394e7775
+Subproject commit 2a7d8aac072fc47beedd3eaebaefe88aaa7860ee