rwatson 37654f9d78 Assert the tcbinfo write lock in tcp_new_isn(), as the tcbinfo lock
protects access to the ISN state variables.

Acquire the tcbinfo write lock in tcp_isn_tick() to synchronize
timer-driven isn bumping.

Staticize internal ISN variables since they're not used outside of
tcp_subr.c.

MFC after:	2 weeks
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