Update git submodules

Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to 8b18d6ac181f464e44e2b3f5b6b3affdeb249e7b
  - Merge "Rename collect_logs() -> collect_netvirt_logs()"
  - Rename collect_logs() -> collect_netvirt_logs()

    Since we moved collect_logs() from the openstack deploy
    script to the common_functions lib, it loses the context
    that it's openstack/netvirt related log collections.
    Changing it's name will make it more clear for others
    that may see it and find it useful (or not).

    Change-Id: I3eca09cdf512960481fc576207b486dfd27615b6
    Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>