Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to c52cca753f00b02349cd6f025b3217ca2f1f4e75
  - Merge "Move string literal left side-avoid null pointer ex"
  - Move string literal left side-avoid null pointer ex

    Move string literal left side so.adapters.vnfmadapter WebSecurityConfigImpl class

    Issue-ID: SO-2187

    Signed-off-by: sindhu3672 <arcot.sindhuri@huawei.com>
    Change-Id: I6669a11bf95a41e3efa18d907f2b3f3eb3f3f1b3

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index adf7790..c52cca7 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit adf7790712eb164aa6bc6e91f5d19cdb39bd0f0f
+Subproject commit c52cca753f00b02349cd6f025b3217ca2f1f4e75