APF: add debug code.

1. Store additional debug information when RA filtering.
2. Add a toString method for RA packets.
3. Make "adb shell dumpsys connectivity apf" dump APF filter
   state.

Bug: 26238573
Change-Id: I1441ff7bc90e63624f8b10a220b2ac97f4d390a5
1 file changed
tree: bb21a64e863565cc148b2f882dae02a048a62af2
  1. core/
  2. services/
  3. tests/