Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 6a6ac7539aeeb83bab6d87798f1ef1a0ba98597f
  - Merge "Integrate Logging Library"
  - Integrate Logging Library

    Updated SO to use ONAP provided filters and constants to meet logging
    standards.
    Removed redundant classes
    Updated constant references

    Issue-ID: SO-2301
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: Ia4e3c2b1a4dcb3881aa34d39885c8b2782880d64

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 3f65ba0..6a6ac75 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 3f65ba0e3e311c5454fa8d7053d72ba11d025ff3
+Subproject commit 6a6ac7539aeeb83bab6d87798f1ef1a0ba98597f