Ticket 47538 - repl-monitor.pl legend not properly sorted
Description: Custom color codes/lowmarks were not properly sorted
and led to the HTML legend being out of order. Also,
made the "unknown" lag time color code consistent.
https://fedorahosted.org/389/ticket/47538
Reviewed by: nhosoi & viktor(Thanks!)
(cherry picked from commit 14fcac3166a4925b080d7b3349f9664f42696588)