Avoid use of interface in struct because cygwin compilers apparently object (go figure)

This commit was SVN r29388.

opal/dss/dss_open_close.c

@@ -172,12 +172,12 @@ OBJ_CLASS_INSTANCE(opal_diskstats_t,
 
 static void netstat_cons(opal_netstats_t *ptr)
 {
-    ptr->interface = NULL;
+    ptr->net_interface = NULL;
 }
 static void netstat_dest(opal_netstats_t *ptr)
 {
-    if (NULL != ptr->interface) {
-        free(ptr->interface);
+    if (NULL != ptr->net_interface) {
+        free(ptr->net_interface);
     }
 }
 OBJ_CLASS_INSTANCE(opal_netstats_t,

opal/dss/dss_pack.c

@@ -530,7 +530,7 @@ static int pack_net_stats(opal_buffer_t *buffer, opal_netstats_t *ns)
     uint64_t i64;
     int ret;
 
-    if (OPAL_SUCCESS != (ret = opal_dss_pack_buffer(buffer, &ns->interface, 1, OPAL_STRING))) {
+    if (OPAL_SUCCESS != (ret = opal_dss_pack_buffer(buffer, &ns->net_interface, 1, OPAL_STRING))) {
         return ret;
     }
     i64 = (uint64_t)ns->num_bytes_recvd;

opal/dss/dss_types.h

@@ -178,7 +178,7 @@ typedef struct {
 OPAL_DECLSPEC OBJ_CLASS_DECLARATION(opal_diskstats_t);
 typedef struct {
     opal_list_item_t super;
-    char *interface;
+    char *net_interface;
     unsigned long num_bytes_recvd;
     unsigned long num_packets_recvd;
     unsigned long num_recv_errs;

opal/dss/dss_unpack.c

@@ -719,7 +719,7 @@ static int unpack_net_stats(opal_buffer_t *buffer, opal_node_stats_t *ns)
     for (i=0; i < n; i++) {
         net = OBJ_NEW(opal_netstats_t);
         m=1;
-        if (OPAL_SUCCESS != (ret = opal_dss_unpack_buffer(buffer, &net->interface, &m, OPAL_STRING))) {
+        if (OPAL_SUCCESS != (ret = opal_dss_unpack_buffer(buffer, &net->net_interface, &m, OPAL_STRING))) {
             OPAL_ERROR_LOG(ret);
             OBJ_RELEASE(net);
             return ret;