Revert "Revert "Revert "Revert "Add APIs that allow to exclude r..."

Revert "Revert "Revert "Revert "Add VpnServiceBuilderShim for Vp..."

Revert submission 1941195-revert-1931760-reland-vpn-impl-part-2-WGARECSJEM

Reason for revert: fixed merge conflict with aosp/1938197
Reverted Changes:
Ic25e5e4ea:Revert^2 "Revert "Add CTS tests for exclude VPN ro...
Ic72cafcf5:Revert "Revert "Revert "Add APIs that allow to exc...
I53802190a:Revert "Revert "Revert "Add VpnServiceBuilderShim ...

Change-Id: Id3e5f698cf8965fa8386a98bed1fd0170a9e0344