decrease socket buffers sizes to same as ptl code

This commit was SVN r8072.

ompi/mca/btl/tcp/btl_tcp_component.c

@@ -214,9 +214,9 @@ int mca_btl_tcp_component_open(void)
     mca_btl_tcp_module.super.btl_min_send_size =
         mca_btl_tcp_param_register_int ("min_send_size", 64*1024);
     mca_btl_tcp_module.super.btl_max_send_size =
-        mca_btl_tcp_param_register_int ("max_send_size", 256*1024);
+        mca_btl_tcp_param_register_int ("max_send_size", 128*1024);
     mca_btl_tcp_module.super.btl_min_rdma_size = 
-        mca_btl_tcp_param_register_int("min_rdma_size", 256*1024); 
+        mca_btl_tcp_param_register_int("min_rdma_size", 128*1024); 
     mca_btl_tcp_module.super.btl_max_rdma_size = 
         mca_btl_tcp_param_register_int("max_rdma_size", INT_MAX); 
     mca_btl_tcp_module.super.btl_flags  =