Fix vFW Closed Loop robot test case

Fix vFW Closed Loop robot test case

Issued addressed by this change:

* Send the invariantUUID of VPKTG to Policy instead of VFW
* Extraneous single quote characters in the policy yaml
* Policy update wouldn’t “stick” until I added in the delays
  in between the various Policy API calls
* Had to ignore the VID teardown errors; not sure if this is
  necessary to pass the closed loop test

Change-Id: Ie504736484df78c46f564ee21bbd0c22d494af1f
Issue-ID: INT-406
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>