test: reduce number of workers in config

Prevent possible error "nginx: [emerg] the maximum number of files
supported by select() is 1024". The cause of the error is an
attempt to use the select() by default.

Author: romanhabibov

test/ngx_confs/nginx.dev.conf

@@ -10,6 +10,6 @@ pid logs/nginx.pid;
 
 error_log stderr;
 
-events {worker_connections 4000; multi_accept on;}
+events {worker_connections 1000; multi_accept on;}
 
 include tnt_server_test.conf;