Add support for TCP state names used by Solaris.

For compatibility, add the TCP state names used by Solaris
and given in the Dtrace Guide available at
https://docs.oracle.com/cd/E37838_01/html/E61035/glhgu.html#OSDTGglhmv

Reviewed by: markj@
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D16269