- Some code are used many times, it's better to make them as
common code for reducing inconsist behavior.
- Also stop using Boolean to represent network permissions and
replace them with int value. Because using Boolean for
permission comparison is really complicated and bizarre.
- Use PERMISSION_* for netd network permission directly.
Bug: 189705071
Test: atests FrameworksNetTests
Change-Id: I2a4e298b9a01f4b2874ae68e9d9539a0ab4aff4c
b7dd7a3f4b