Add support for remote telnet-based console servers.
We already supported "remote mode" (-m) which told capture that the device command line argument was of the form "host:port". Extended that to "host:port,protocol" where protocol can be "raw" (aka, the current remote mode) or "telnet". Telnet support is provided through the libtelnet library (http://github.com/elanthis/libtelnet) which I created a FreeBSD port for in install/ports. Most of the work was just breaking out some code in the monster select loop. Only tested on the Linux Networx "icebox" and only very lightly. The set of telnet want/won't/do/don't options may not be correct, but it seems to work. Also cleaned up some lint.