Add color log output for debug, warnings, and errors.
Review Request #7716 — Created Oct. 20, 2015 and submitted
This makes use of the third-party colorlog module to add color to some of our log types. We only do this when outputting directly to a terminal.
Tested the different log types when outputting to a terminal and when
outputting to a log file orless
. Saw the color only in the terminal
case.