* added a synchronous cluster simulation
* added a test for the sync function
* moved signing into its own module
* refactored imports to solve circular import problems stemming from the task module pretending to be a cluster
* added documentation for the new sync option
The core module was becoming too large.
By splitting it in cluster, monitor and tasks it becomes more manageable. It also reflects the documentation structure.
New admin test introduced a task in the queue which was picked up by the cluster on Travis. Switching cluster test to different list key should prevent this.
Workers now share a ctype with the sentinel to indicate if they are currently executing a task. This timer is incremented each guard loop until the worker resets it after finishing a job or until it reaches the TIMEOUT value and the worker is terminated by the sentinel.
Ilan Steemers