proxies: adding rewritecond to reverseproxy for ws if remotepath exists

I was hitting an issue where there were multiple reverseproxy instances
configured for a single host and some of the rewrite rules were changing
the request when they shouldn't be.

This patch adds a rewritecond to the websocket rewrite rule to make sure that
the REQUEST_URI starts with $remotepath before it's rewritten.

roles/httpd/reverseproxy/templates/reversepassproxy.conf

@@ -47,6 +47,9 @@ SSLProxyEngine On
 RewriteEngine on
 RewriteCond %{HTTP:Upgrade} ^WebSocket$ [NC]
 RewriteCond %{HTTP:Connection} Upgrade [NC]
+{% if remotepath is defined %}
+RewriteCond %{REQUEST_URI} ^{{ remotepath }}/(.)*
+{% endif %}
 RewriteRule .* "balancer://{{ balancer_name }}-websocket%{REQUEST_URI}" [P]
 
 <Proxy "balancer://{{balancer_name}}">