Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add separate fraser jobs to Barometer container builds"
  - Add separate fraser jobs to Barometer container builds

    In order to support additonal features that have been added to
    collectd since the 5.8 release, there needs to be a separate
    stable and master container so we can support the new features
    as well as the stable release.

    This change will allow us to increment the version of collectd
    as we add functest support, config guides and documentation,
    while keeping the stable version container intact and available
    for users to download.

    JIRA: BAROMETER-102

    Change-Id: I06ca84581a2e0f1a994cedf53aebc8f5cc3e7535
    Signed-off-by: Emma Foley <emma.l.foley@intel.com>