VpnService: stop VPN when unknown DNS servers show up.
VpnService: stop VPN when unknown DNS servers show up.

Bug: 5002601
Change-Id: I5459db009e7391ff874623cb1830065ac75c80ed

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base