Allows sub-uri deployment

With this patch you can install foreman to sub-uri like this
```
foreman-installer --foreman-foreman-url="https://example.com/foreman" --foreman-proxy-foreman-base-url="https://example.com/foreman"
```
When RewriteRule is applied, apache responds immediately with 406, rewrite log does not log anything. I know that passenger had lot of issues with mod_rewrite so I think there's some incompatibility. I was not able to find a solution so I'm just turning off this optimization on suburi deployment. I think it's not a big deal, apache gzips the css and js itself and I believe it caches it.