add option - tee output to logfile

[mweitzel]

The problem with piping to tee:

This project remaps [crtl-] to [ctrl-r], and handles the signal with a restart. Similar to how it would respond to firetower -r. here

So, with firetower 'echo hi' | tee logfile.txt, you can catch the logs. and firetower -r continues to work as expected. But the ctrl-r somehow breaks the pipeline instead of restarting the firetower host.

Add an option which would tee to a logfile so the firetower host process can still respond to [ctrl-r].