First cut of the multiprocessing support for vPoller
Process management messages in the vPoller Worker Manager
Fix vpoller-worker management methods
Add 'db' and 'proxy' options to the config defaults of vPoller Worker
VPollerWorker class now extends multiprocessing.Process
Rename shutdown() method to signal_stop() as this is what it really does
VPollerWorker class refactoring after the 'multiprocessing' changes
Update vpoller-worker cli script to make use of the new
'multiprocessing' features

* Also remove the '--daemon' flags as we should be getting rid of the
  custom daemonizing code soon
vpoller-worker: management endpoint is defined in the 'worker' section
vpoller-worker: join() processes after 3 timeout
Cosmetics
Initial commit of the VPollerProxyManager class
Refactor VPollerProxy class for use with 'multiprocessing' support

* Split management from client tasks
* Management interface is now bound to the parent process
  and tasks are being distributed via a child VPollerProxy process
multiprocessing logging changes
Cosmetics
Get rid of the custom daemonization code
Remove leftovers
More leftovers
Instantiate attributes in __init__()
Argument 'concurrency' is an int object