Update setter/getters to configure underlying network priority

- Update setters for configuring meteredness, roaming and
  opportunistic to take an int instead of a boolean
- Update NetworkPriorityClassifier and tests accordingly

Bug: 206044122
Test: atest FrameworksVcnTests, CtsVcnTestCases
Change-Id: I92bd2831cc42d634d73b842c42d18fa93a4ed46c