Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Fixes load-balancing jobs for virtual verify

    Issue where apex-virtual-master label node was being passed from verify
    job to deploy/functest.  We allow multiple verify jobs to kick off on
    virtual slaves, but then passing the host down to the deploy/functest
    jobs causes the deploy/functest only run 1 job at a time on the same
    node, rather than running 2 jobs at a time, one on each slave.

    Change-Id: I1648eb6b84f17a2b08db4d161effe977c7952d63
    Signed-off-by: Tim Rozet <trozet@redhat.com>