improve uwsgi_modifierX processing: *) use ngx_conf_set_num_slot() *) check bounds *) check duplicates
improve uwsgi_modifierX processing:
*) use ngx_conf_set_num_slot()
*) check bounds
*) check duplicates

hy0kl/nginx,hy0kl/nginx,firebase/nginx,firebase/nginx,hy0kl/nginx,firebase/nginx,firebase/nginx