MODULES-1382: support multiple access log directives

MODULES-1382: https://tickets.puppetlabs.com/browse/MODULES-1382
Actually:

```ruby
env ||= "env=#{log['env']}" if log['env']
env ||= ''
```

That said, I'd say this is not logic that should be in a template but should be passed and used as-is with the logic whereever the template is included at.