Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Removed current working directory logic retrieving test file resources.

    Some of the SNAPS tests leverage file resources contained within the
    project. These resources were being accessed via relative paths which
    required the test clients to ensure that the CWD was the <repo>/snaps
    directory. Replaced that logic to leverage the import pkg_resources
    making the tests much more flexible and robust.

    JIRA: SNAPS-89

    Change-Id: Ic9c429ee53e4dd785641e11e1ed4de5aeeab54d1
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>