Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to a7da6f2fe455634f65cd98f0509972b0c1bd585b
  - bugfix for heatbridge keystone v3 not returning any resources
    Issue-ID: SO-1484

    Change-Id: Ic1341e94086470c59aab324a3ea16e4e7e086d38
    Signed-off-by: Munir Ahmad <munir.ahmad@bell.ca>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index f819203..a7da6f2 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit f81920304c7b62637d32473e672a1e51275ce54b
+Subproject commit a7da6f2fe455634f65cd98f0509972b0c1bd585b