Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to cd7f7a357a4a85de096f3ce7b6d20d0df655af79
  - Merge "Add SO Update to default the controller type query as "APPC" instead of null."
  - Add SO Update to default the controller type query as "APPC" instead of null.

    Make a change to treat a return of null from a controller type query as "APPC"
    This can avoid the nullpointer Exception and the default is set
    to APPC if the entry is missing in the controller_selection_reference table.
    Issue-ID: SO-2170
    Signed-off-by: Bonkur, Venkat (vb8416) <vb8416@att.com>
    Change-Id: Ia76b2d06e4dacb8b7f6984edeb4d2758472192b1