Port all Celery worker functions to discrete pkg

Moves all tasks run by the Celery worker into a discrete package/module
for easier installation. Also adjusts several parameters throughout to
accomplish this.

gen-api-doc

@@ -8,7 +8,7 @@ import os
 import sys
 import json
 
-os.environ['PVC_CONFIG_FILE'] = "./api-daemon/pvcapid.sample.yaml"
+os.environ['PVC_CONFIG_FILE'] = "./pvc.sample.conf"
 
 sys.path.append('api-daemon')