Per Paul Hargrove: add another file system name

This commit was SVN r25939.

test/util/opal_path_nfs.c

@@ -154,6 +154,7 @@ void get_mounts (int * num_dirs, char ** dirs[], bool * nfs[])
 
         nfs_tmp[mount_known] = false;
         if (0 == strcasecmp (fs, "nfs") ||
+            0 == strcasecmp (fs, "nfs4") ||
             0 == strcasecmp (fs, "lustre") ||
             0 == strcasecmp (fs, "panfs") ||
             0 == strcasecmp (fs, "gpfs"))