sock api: allow to start client with no rx_thread

Change-Id: Ia30ff1e62304e65f27497ce05f8e40631c06d69e
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
diff --git a/src/vat/api_format.c b/src/vat/api_format.c
index d35c19e..5ddbb57 100644
--- a/src/vat/api_format.c
+++ b/src/vat/api_format.c
@@ -22025,7 +22025,7 @@
   config[6].count = 128;
   config[6].size = sizeof (uword);
 
-  rv = vl_socket_client_init_shm (config);
+  rv = vl_socket_client_init_shm (config, 1 /* want_pthread */ );
   if (!rv)
     vam->client_index_invalid = 1;
   return rv;