Update git submodules

Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Updates RPM specs and building"
  - Updates RPM specs and building

    Changes Include:
     - Disables ONOS from rpm and image building
     - Fixes opnfv-apex package dependency for python34-opnfv-apex
     - Updates requirements for python34-opnfv-apex
     - Updates docs
     - Removes temporary build qcow2 for odl which was being bundled
       into our dev tars unnecessarily

    Change-Id: Ief668067181fc35a54553ae118b7950bddce1940
    Signed-off-by: Tim Rozet <trozet@redhat.com>