Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to ad73b9e2686d5eabe6e2289fd3cc7fefcad9558e
  - Merge "Pass the revised value of usePreload to JSON"
  - Pass the revised value of usePreload to JSON

    Pass the possibly revised value of usePreload to JSON going to BPMN.

    Change-Id: Idc46a8786bc7bbdbf860b59998785c1c885689e4
    Issue-ID: SO-1652
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 6bcd113..ad73b9e 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 6bcd113098d1211dbe578335719c6bb95be31310
+Subproject commit ad73b9e2686d5eabe6e2289fd3cc7fefcad9558e