Improve job worker prefix uniqueness
|Target version:||Release 2.3.0|
|Google Code Legacy ID:||Tested version:|
Currently we're using site title / base url to generate a unique prefix for atom worker gearman jobs. However, if you have 2 sites on the same server and replicate the dbs between them (as is often the case with a test site / production setup), atom-workers might poach jobs from the wrong atom instance and break.
We should add the directory path back to the prefix to ensure this doesn't happen.