Fix nginx default vhost

Task referenced missing file from older commit.
Add Kibana role
Add nginx vhost task

Adds nginx vhost task and configuration.

Mostly used for upstream proxies. It is still very rough around the
edges.
Add logging host varibles

This configures nginx for the kibana role.
Fix yaml error

Add string hint for the template.
Amend elasticsearch variables
Add ansible configuration

This uses merge for the hash_behaviour which is the only major
difference from the typical ansible usage.