Add more tests for CaptivePortalData

Add missing tests to cover all system APIs

Bug: 152280218
Bug: 150640683
Test: atest CtsNetTestCasesLatestSdk:CaptivePortalDataTest on
      both Q and R device
Change-Id: I6d3826922f16816d5b18ed3540266442a0ed3e49
Merged-In: I6d3826922f16816d5b18ed3540266442a0ed3e49
(cherry picked from commit d9f9bf34)