Support Devstack and Console Logs

Adds support for Devstack and Console style logs,
as well a fixing a bug in the Oslo log parser
that caused it to not format lines that didn't
have a PID
Added Support for Keystone-Style Logs

Keystone Logs are now supported via log_type=keystone.
Additionally, the order of the date/time and subject can
be inverted with the invert_order=true query string option.