Update git submodules

Update git submodules

* Update docs/submodules/vid.git from branch 'master'
  to d506921fc02e398dbe27f9ba113928e9264b1bdc
  - Merge changes Iede12655,I73fcc78e

    * changes:
      add endpoints for getVpnList and getActiveNetworkList
      use cache for retrieving all subscribers list

  - add endpoints for getVpnList and getActiveNetworkList

    Issue-ID: VID-378
    Signed-off-by: Eylon Malin <eylon.malin@intl.att.com>
    Change-Id: Iede126556df337b1ab70dd76c9452f4b51e11376

  - use cache for retrieving all subscribers list

    Issue-ID: VID-378
    Signed-off-by: Eylon Malin <eylon.malin@intl.att.com>
    Change-Id: I73fcc78ebbd8ee01349ecefa924c20014ca33907