Merging Rob's AZ improvements

Also partial-monty pattern, various other pattern fixes

Conflicts:
	nepho/data/deployments/mediawiki.yaml
Stop writing logs to /tmp
Fixing invalid DBName parameter in production
Changing availability zones, argh
Merge branch 'mediawiki-poc' into hartmann-mediawiki-poc

Conflicts:
	nepho/data/deployments/mediawiki.yaml