Update git submodules

Update git submodules

* Update docs/submodules/policy/parent.git from branch 'elalto'
  to 593d41e8290b343bfe28b6438420b399ab09d5bc
  - Add POSTMAN collection and env

    Have the offered API's be at a top level that points to the
    existing API's throughout policy.

    Add in downloads for example environment and collection for
    Postman.

    Issue-ID: POLICY-2114
    Change-Id: Ie2edf2f0aacfe7c9bb14c3e9f83f74a8a2a72de6
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
    (cherry picked from commit 22ded7ec14cb82113c37d1b369670e42179f92c5)