Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 0de788a5af875ee19a582672cc4e05b0e247a921
  - Merge "Add additional null checks when building pserver objects from openstack server object. This error is not reproduceable with mitaka and queens release of openstack"
  - Add additional null checks when building pserver objects from
    openstack server object. This error is not reproduceable with
    mitaka and queens release of openstack

        Issue-ID: SO-2802

    Signed-off-by: Munir Ahmad <munir.ahmad@bell.ca>
    Change-Id: I8c7a31d98ba4ef05faaf07ded0da13120fddf2c7