Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Deactivated test heat template's volume encryption."
  - Deactivated test heat template's volume encryption.

    Removed volume encryption from the test volume heat template as
    it is no longer operating properly against a Pike pod. Created the
    ticket SNAPS-245 to address this issue sometime in the future.

    JIRA: SNAPS-240

    Change-Id: I610dbba4ebadd5dfb360a665b7a543be6ef5fb1c
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>