CP-10514: Watch RDP status in Windows PV tool

Add Instance modify event watch to check if RDP status changed

Signed-off-by: Cheng Zhang <cheng.zhang@citrix.com>
Merge pull request #11 from cheng--zhang/CP-10514

CP-10514: Watch RDP status in Windows PV tool

Approved-By: Ben.Chalmers@citrix.com