Update git submodules

Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Adds Barometer service"
  - Adds Barometer service

    Adds Barometer service as a deploy option to Compute nodes by specifying
    barometer as true in deploy settings.
    Barometer packages are installed only for x86_64.
    Adds scenarios os-nosdn-bar-ha and os-nosdn-bar-noha.
    Add scenarios to opnfv-apex-common.spec.
    Temporarily remove references to snmp packages.

    apex-tripleo-heat-templates: I397d2557639c87ab8afacd076a5b9fd7c056dce7
    apex-puppet-tripleo: I878ff8d1e0a8b96f3380bb77f168cd5a4c3f6543

    Puppet module is at: https://github.com/johnhinman/puppet-barometer.

    Change-Id: Ic087c2052f7849ee2cf6c63224558c2b36a8ca1f
    Signed-off-by: jhinman1 <john.hinman@intel.com>