Per clarifications made in the SCTP implementor's guide, 
we should stop sending heartbeats as soon as we either send
SHUTDOWN or send SHUTDOWN-ACK.

Cleanup sctp_transport_t -> sctp_transport.
Fix some missing entries in the statetable for HB related events.

Per RFC 2960 (well, impl-guide corrections really) add a jitter in the
range of -50% to +50% of the current rto to the heartbeat interval. 

Code had hardcoded limits to the maximum stream that could be used, 
and consequent static data structures.   Now dynamically allocate
storage for the SSN maps until _after_ we know what they are.  
Protocols such as SIP want to use all possible streams.  

into us.ibm.com:/home/sridhar/BK/lksctp-2.5.56

into home.transmeta.com:/home/torvalds/v2.5/linux

into tetrachloride.(none):/mnt/stuff/kernel/2.5/watchdog

into tetrachloride.(none):/mnt/stuff/kernel/2.5/watchdog

into home.transmeta.com:/home/torvalds/v2.5/linux

into tetrachloride.(none):/mnt/stuff/kernel/2.5/agpgart

version before looking at more complicated changes.

This fixes a potential problem in the migration thread for the case that
the first CPU in the cpus_allowed mask of a process is offline.