Add AppOps Checks for MANAGE_IPSEC_TUNNELS

Adds support for a new AppOp to permit services to
use IpSec tunnel mode. The IpSecService now needs
a context so change the service mode to a cached
service rather than a static service.

Bug: 66955045
Test: runtest frameworks-net
Change-Id: I17a4a286225b432c3e15ea1587d946189931b4f4