bbackupquery connection timeout results in error message, should be more graceful

[achim]

$ boxbackup/bbackupquery.exe -c config/bbackupd.conf
NOTICE:  Box Backup Query Tool vtrunk_2549, (c) Ben Summers and contributors 2003-2008
Login complete.

[wait long time for timeout to happen]

query > ls
WARNING: Exception thrown: ConnectionException(Conn_TLSWriteFailed) at SocketStreamTLS.cpp(404)
ERROR:   Failed to list directory: Connection TLSWriteFailed (Probably a network issue between clien
t and server.)


query > usage
ERROR:   SSL error while writing: error:1409F07F:SSL routines:SSL3_WRITE_PENDING:bad write retry
WARNING: Exception thrown: ConnectionException(Conn_TLSWriteFailed) at SocketStreamTLS.cpp(404)
Exception: Connection TLSWriteFailed (Probably a network issue between client and server.) (7/33)