Update git submodules

Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Merge "Nomination of committer promotion for Akhil Batra"
  - Nomination of committer promotion for Akhil Batra

    Akhil is one of the active QTIP contributors in Euphrates release[1]
    He has contributed a lot in qtip-api and qtip-web[2]. It would be a
    great help to the project to have him as a committer.

    Current committers please vote +1/-1 for this nomination[3]

    [1] http://stackalytics.com/?project_type=opnfv-group&metric=commits&module=qtip&release=pike
    [2] https://git.opnfv.org/cgit/qtip/log/?qt=author&q=akhil.batra@research.iiit.ac.in
    [3] https://wiki.opnfv.org/display/DEV/Committer+Promotions

    Change-Id: I1157d6ed2ee1694c184c8f9630a66a2b4266b038
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>