Use monkeypatch to allow multithreaded prod flask

Without this tasks were blocking when other task were active (for
instance, any task with --wait). Using the moneypatch, these no longer
block.

api-daemon/pvcapid/Daemon.py

@@ -22,6 +22,7 @@
 
 import gevent.pywsgi
 import pvcapid.flaskapi as pvc_api
+from gevent import monkey
 
 ##########################################################
 # Entrypoint
@@ -30,6 +31,7 @@ if pvc_api.config['debug']:
     # Run in Flask standard mode
     pvc_api.app.run(pvc_api.config['listen_address'], pvc_api.config['listen_port'])
 else:
+    monkey.patch_all()
     if pvc_api.config['ssl_enabled']:
         # Run the WSGI server with SSL
         http_server = gevent.pywsgi.WSGIServer(