Update git submodules

Update git submodules

* Update docs/submodules/vid.git from branch 'master'
  to 6c63f8516a7854ee09928a45930b2de097311cd3
  - Merge "Improve clearSessionStorage timings"
  - Improve clearSessionStorage timings

    Hopefully it will solve the flakiness of test named "upgrade vfmodule
    when upgraded already service, vnf and brother vfmodule" that fails on
    missing test_api value which is set by setTestApiParamToGR()

    Issue-ID: VID-647

    Change-Id: I51ba95edf3a7535dec2715054f7f10564a7debe3
    Signed-off-by: Ittay Stern <ittay.stern@att.com>