Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Changes required for running CI tests (Pike pod)."
  - Changes required for running CI tests (Pike pod).

    Added support for HTTPS proxies
    HTTPS OSCreds settings for both RC file and os_env.yaml
    OSCreds 'cacert' T/F and cert file path support
    OSCreds API version support cleanup including the addition
    of heat
    Added more OSCreds test validations
    Disabling of InsecureRequestWarning
    PEP8 line width refactoring
    heat_utils_test.py fix when stack status is error
    test suite for CI
    removed default flavor metadata of mem_page_size: Any to None

    JIRA: SNAPS-80

    Change-Id: I333e83ca79d7403bf43a9b74da4c072b4da976ba
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>