openresty: Package definition updates

Realized that there was a problem with a missing BR2_EXTERNAL variable
and that the ownership was not being defined correctly on some of the
nginx files.

Author: brianredbeard

package/Config.in

@@ -1,3 +1,3 @@
 menu "Networking applications"  
-	source "package/openresty/Config.in"
+	source "$BR2_EXTERNAL/package/openresty/Config.in"
 endmenu

package/openresty/openresty.mk

@@ -43,6 +43,8 @@ OPENRESTY_CONF_OPTS += \
         --pid-path=/var/run/nginx.pid \
         --lock-path=/var/run/lock/nginx.lock \
         --error-log-path=/var/log/nginx/error.log \
+        --user=nobody \                                                        
+        --group=nogroup \ 
         --http-log-path=/var/log/nginx/access.log \
         --http-client-body-temp-path=/var/tmp/nginx/client-body \
         --http-proxy-temp-path=/var/tmp/nginx/proxy \