Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 6fd28af38ec8f90445bbcb0e5fa2328f428da4a8
  - Merge "Remove restriction on mapping String values only"
  - Remove restriction on mapping String values only

    Correct the JUnits to address userParams non-String values
    Remove restriction on mapping of String values only for userParams in
    BB RequestContext.

    Change-Id: I8a0d30e61618c275301d62bf04c064bea56c1b4d
    Issue-ID: SO-1593
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 9cc8a41..6fd28af 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 9cc8a412d9b80d403f477c211eec6870cff248d7
+Subproject commit 6fd28af38ec8f90445bbcb0e5fa2328f428da4a8