Use lsyncd's status log for calculating inotify watches.

The current method of calculating inotify watches can be intensive.  It also requires the configuration file use source="/path/on/disk" otherwise it fails to correctly pick up directories.

Lsyncd makes this information avialable to us in it's status file, so this update defaults to that and will fall back to the other method.
I'd recommend emitting this as an integer in addition to the status string. This will make it easier to graph later on(graphing strings is kind of weird).

`metric ${SERVICE}_running_status int 1`