Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 0e2cda138f35ee6a7a8a54c29a6c4edf07d51745
  - update bpmn to save extsystemerrorsource

    Added ext error source to workflow exception
    Updated all lines that create this exception with source
    Added unit tests and updated existing ones

    Change-Id: Id9b3b1e6e24368224214a6370ea2d450ae667bfb
    Issue-ID: SO-2092
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 294a68f..0e2cda1 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 294a68f814de3820ae3d5fdcf976615ad233c11a
+Subproject commit 0e2cda138f35ee6a7a8a54c29a6c4edf07d51745