Support new redis INFO format

Fixed breakage when looking at a redis server >= 2.4, line breaks
added in the output would stop our processing of data.

Changed how we do support for multiple values on a single line, these
all contain an = (and other metrics do not) so if we see an = we will
do multi metric processing (db, cmdstat are examples)

INFO can now have an argument, so changed how we detect INFO calls

Double checked we work on old and new output still