NS_Provider_IPL4: Implement new "endpoint" mode

This adds a new, optional "endpoint" mode to the IPL4 provider,
where we remove the constraint of "one NSVC per provider", which
in turn is a pre-requirement for real IP-SNS support with full
mesh of NS-VCs.

This code doesn't introduce any users of this "endpoint" mode yet.

Change-Id: I05a50b966b8ce93497372ca403d40fd383dd35f7
1 file changed