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Advance version to 0.99.20ex25b.
Bug fixes:
* when closing a vty, if close() returned an error, the vtys would
fall into a loop trying to recover.
This was found on FreeBSD, which will return ECONNRESET on close(),
which is not standard POSIX behaviour.
* when closing a vty in response to EPIPE or ECONNRESET, managed to
leave the vty mutex locked.
This stopped the Routing Engine *dead* on the next CLI command
that required the Routing Engine. SIGTERM/SIGINT would not
stop bgpd -- a SIGKILL would be required.
Other changes:
* toned down the error reporting of EPIPE in the vty -- so no
longer looks like an error...
...closing a vty by "exit" command is logged as "closed"
...closing a vty in response to the client closing their end of
the connection is logged as "terminated: terminal closed",
and no longer logs an EPIPE error.
* changed error reporting on close() and shutdown() for vty, so
that nothing is logged if an i/o error has already logged...
...so that redundant error messages are suppressed.
* applied slightly finer jittering to bgpd timers.
* work in progress on new vtysh.
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