CTS test for PacProxyManager

Bug: 181745786
Test: build CtsNetTestCases pass
      CtsNetTestCases:PacProxyManagerTest
      CtsNetTestCases:CaptivePortalTest
Original-Change: https://android-review.googlesource.com/1705131
Merged-In: I88cf3ecac12f4e8726d95a9b051e83eb719b0702
Change-Id: I88cf3ecac12f4e8726d95a9b051e83eb719b0702
2 files changed