Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "vswitchperf: Use POD12 for VERIFY and MERGE jobs"
  - vswitchperf: Use POD12 for VERIFY and MERGE jobs

    In the past, vswitchperf's VERIFY & MERGE jobs were
    executed at ericsson-build3 & build4 machines. However
    VPP sometimes refuses to start properly and it is hard
    to debug root cause without access to these servers.
    Thus description of VERIFY & MERGE jobs was changed
    to run them by default at POD12, which is dedicated
    to vswitchperf project. In case that daily job is active,
    then VERIFY & MERGE jobs will be executed at ericsson-build4
    as before.
    Execution of "make sanity" was removed, because this
    target is a "stub" in vsperf makefile.

    Change-Id: Iec0f788ab28425d0999811ceb5236e097cee2ff4
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
    Reviewed-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>
    Reviewed-by: Trevor Bramwell <tbramwell@linuxfoundation.org>