Use the Private DNS bypass logic that was moved into Network.
Once all callers of ResolvUtil are updated to use this interface
ResolvUtil can be deleted.
Test: as follows
- built, flashed, booted
- runtest frameworks-net passes
- connection to captive portal network detects portal correctly
and the login activity functions as expected
Bug: 64133961
Bug: 72345192
Bug: 73872000
Bug: 78548486
Change-Id: If11ef2b5ffdc729f8449cf18dccd5f1eccbc51e6
767b7f2021