Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to ceac74f3e71d46120da85257351432f367cc48d6
  - Merge "Replace collections size with isEmpty"
  - Replace collections size with isEmpty
    
    Replace collections size with isEmpty mso-adapter-utils class
    
    Issue-ID: SO-2187
    
    Signed-off-by: sindhu3672 <arcot.sindhuri@huawei.com>
    Change-Id: Icf6fc86d9d6f02571938804d214b5b5bfca72698
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 3081381..ceac74f 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 3081381bb2ba253fc0aa34203c90ea8bf63b26b4
+Subproject commit ceac74f3e71d46120da85257351432f367cc48d6