Update git submodules

Update git submodules

* Update docs/submodules/ccsdk/features.git from branch 'master'
  to fefd8620a4da1136eab869597af5ce475398198c
  - Merge "Refer to SDN-R as controller persona"
  - Refer to SDN-R as controller persona

    Updated SDN-R user documentation to refer to SDN-R as a 'SDN controller
    persona for Radio' rather than 'SDN controller for Radio'.  This
    is to clarify that SDN-R is a controller persona (i.e. a
    deployment configuration), and not a competing, independent
    controller to SDN-C.

    Change-Id: I8fd6f790e70a59c1c73bb80b8fc0914fd7d1b634
    Issue-ID: CCSDK-1809
    Signed-off-by: Dan Timoney <dtimoney@att.com>