Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to e13b7b2b54a213b746494b910dd052335f5335bb
  - Merge "Add missing so-appc-orchestrator dependency to docker/pom.xml"
  - Add missing so-appc-orchestrator dependency to docker/pom.xml

    Fixes issues with building docker images and jenkins docker staging job

    Issue-ID: SO-2622
    Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
    Change-Id: Iecf531eebf0d9a876e00943177819543c27fabdd

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index f39f996..e13b7b2 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit f39f99626d9eae25d13b313cdcf908f91c042496
+Subproject commit e13b7b2b54a213b746494b910dd052335f5335bb