Revert "Delete VPN methods in ConnectivityManager."

This reverts commit 279b79f062b2fe79e9a18620281da872f7f99a20.

Bug: 180710918
Reason for revert: Broken build 

Change-Id: I6e6318b4c01ccab27ca3e9f16bb2194aa1d9ffd2
3 files changed