These permissions allow the system server to create and
bind a UDP socket such that it gains the SOCK_BINDPORT_LOCK.
(ref: af_inet.c - inet_bind()) This prevents the user from
disconnecting the socket, which would create a security
vulnerability. The user may then use the provided socket,
which is always IPv4/UDP, for IKE negotiation. Thus, an
un-trusted user app must be able to use the socket for
communication.

-ALLOW: read, write, connect, sendto, and recvfrom.
-NEVERALLOW: anything else

Bug: 30984788
Test: CTS tested via IpSecManagerTest:testUdpEncapsulationSocket

Change-Id: I045ba941797ac12fd14a0cce42efdd2abc4d67e0