Changes

Make sure to NOTIFY current state to peer after ASP UP ACK / REG RESP

As per  RFC4666 4.3.4.5:
"""
When an ASP moves from ASP-DOWN to ASP-INACTIVE within a particular AS,
a Notify message SHOULD be sent, by the ASP-UP receptor, after sending
the ASP-UP-ACK, in order to inform the ASP of the current AS state."""

It also needs to be done for REG RESP in order to support dynamic
ASPs/ASs, since in that case if dynamic ASP sends to SG an ASP-UP msg,
it contains no RCTX/AS reference, and hence the ASP will only be
assigned to an AS after the REG-REQ is sent, at which point we can send
the AS status to it.

Change-Id: I3dffa2e9c554f03c7c721b757ff33a89961665b5