Have uWSGI start workers lazily …such that each process loads it's ow…

…n complete application rather than forking the master. This now requires the spooler to setup django.

Lazy apps are needed if telemetry is to be sent to Azure Application Insights: the `opencensus` library starts a background thread on launch to transport telemetry to Azure, but if uWSGI loads the application and _then_ forks, this thread is no longer accessible from the new process.

cashbook.ini

@@ -1,7 +1,7 @@
 [uwsgi]
 procname = uwsgi_%n
 die-on-term = 1
-lazy-apps = 0
+lazy-apps = 1
 vacuum = 1
 
 master = true

mtp_cashbook/tasks.py

@@ -1,3 +1,5 @@
+import django
 from mtp_common.spooling import autodiscover_tasks
 
+django.setup()
 autodiscover_tasks()