SELinux: Fix keepalived killall denials

A custom policy to temporarily fix the killall denials until the
upstream SELinux policy and keepalived packages are updated.

Change-Id: Ie0d8529d22fc39acaede8a3f1985c50ead76f1f3
Partial-Bug: 1379079
Merge "SELinux: Fix keepalived killall denials"