Per request by Shiqing, specifically exclude the "lo" interface from the TCP btl. Apparently, Windows sometimes fails to resolve the 127.0.0.1 to "lo", causing subsequent failures.

This commit was SVN r27283.

ompi/mca/btl/tcp/btl_tcp_component.c

@@ -191,7 +191,7 @@ static int mca_btl_tcp_component_register(void)
     mca_btl_tcp_component.tcp_if_include =
         mca_btl_tcp_param_register_string("if_include", "Comma-delimited list of devices and/or CIDR notation of networks to use for MPI communication (e.g., \"eth0,192.168.0.0/16\").  Mutually exclusive with btl_tcp_if_exclude.", "");
     mca_btl_tcp_component.tcp_if_exclude =
-        mca_btl_tcp_param_register_string("if_exclude", "Comma-delimited list of devices and/or CIDR notation of networks to NOT use for MPI communication -- all devices not matching these specifications will be used (e.g., \"eth0,192.168.0.0/16\").  If set to a non-default value, it is mutually exclusive with btl_tcp_if_include.", "127.0.0.1/8,sppp");
+        mca_btl_tcp_param_register_string("if_exclude", "Comma-delimited list of devices and/or CIDR notation of networks to NOT use for MPI communication -- all devices not matching these specifications will be used (e.g., \"eth0,192.168.0.0/16\").  If set to a non-default value, it is mutually exclusive with btl_tcp_if_include.", "127.0.0.1/8,sppp,lo");
 
     mca_btl_tcp_component.tcp_free_list_num =
         mca_btl_tcp_param_register_int ("free_list_num", NULL, 8);