* take a stab at fixing #99. ignore invalid output before we see a real packet. the complication here was ensuring we always output a real packet in every flow so we don't actually lose valid errors.
* add ping packets to prime the parser (when in ignoreUntilValid mode)
* fix ability to log into ssh with key and password
A previous refactor to the ssh password system broke the ability to use
key+password to log in. This change handles key+password as a special
case allowing it to be handled separately.
* clean up unnecessary print
My last change left in a debug print that wasn't necessary in the code.
This has been removed.
