Fix for MPI 2 dynamics.

The NS replica should give out tags that are over ORTE_RML_TAG_DYNAMIC
or it will overlap with other outstanding tags. This overlap was killing
MPI_Comm_spawn when a program tried to use it multiple times (> 3).

With this fix MPI_Comm_spawn is behaving properly.
A program can call it many times in a row with out problem.

NOTE: Not tested for multi-threaded build yet

(A long time debugging for a one liner... :/)

This commit was SVN r7529.

orte/mca/ns/replica/src/ns_replica.c

@@ -545,7 +545,7 @@ int orte_ns_replica_assign_rml_tag(orte_rml_tag_t *tag,
         OPAL_THREAD_UNLOCK(&orte_ns_replica.mutex);
         return rc;
     }
-    tagitem->tag = orte_ns_replica.num_tags;
+    tagitem->tag = orte_ns_replica.num_tags + ORTE_RML_TAG_DYNAMIC;
     (orte_ns_replica.num_tags)++;
     if (NULL != name) {  /* provided - can look it up later */
         tagitem->name = strdup(name);