racoon: Use capabilities instead of GIDs.

The 'net_admin' GID is an Android addition that does not exist
upstream. Replace it with capabilities which are an upstream feature.
This will allow us to drop those kernel patches.

Bug: 33938230
Test: 'start racoon', 'cat /proc/`pgrep racoon`/status'.
Test: "Cap" lines show correct mask: 0000000000001000

Change-Id: I498ab9fe670b3034e053e8350d12599b716d232f
1 file changed