optimize: Remove www-data user and group

While the www-data user and group are part of the buildroot
skeleton, we prefer to utilize the builtins of "nobody" & "nogroup"

Author: brianredbeard

package/openresty/openresty.mk

@@ -42,8 +42,6 @@ OPENRESTY_CONF_ENV += \
 OPENRESTY_CONF_OPTS += \
         --pid-path=/var/run/nginx.pid \
         --lock-path=/var/run/lock/nginx.lock \
-        --user=www-data \
-        --group=www-data \
         --error-log-path=/var/log/nginx/error.log \
         --http-log-path=/var/log/nginx/access.log \
         --http-client-body-temp-path=/var/tmp/nginx/client-body \