coll/[sm|han|adapt]: don't disqualify on priority 0

Signed-off-by: Joseph Schuchart <schuchart@icl.utk.edu>
(cherry picked from commit 09c2f4af9437accd747e823c591927481c2103ad)

ompi/mca/coll/adapt/coll_adapt_module.c

@@ -146,7 +146,7 @@ mca_coll_base_module_t *ompi_coll_adapt_comm_query(struct ompi_communicator_t *
     /* Get the priority level attached to this module.
        If priority is less than or equal to 0, then the module is unavailable. */
     *priority = mca_coll_adapt_component.adapt_priority;
-    if (mca_coll_adapt_component.adapt_priority <= 0) {
+    if (mca_coll_adapt_component.adapt_priority < 0) {
         opal_output_verbose(10, ompi_coll_base_framework.framework_output,
                             "coll:adapt:comm_query (%d/%s): priority too low; "
                             "disqualifying myself",

ompi/mca/coll/han/coll_han_module.c

@@ -188,7 +188,7 @@ mca_coll_han_comm_query(struct ompi_communicator_t * comm, int *priority)
     /* Get the priority level attached to this module. If priority is less
      * than or equal to 0, then the module is unavailable. */
     *priority = mca_coll_han_component.han_priority;
-    if (mca_coll_han_component.han_priority <= 0) {
+    if (mca_coll_han_component.han_priority < 0) {
         opal_output_verbose(10, ompi_coll_base_framework.framework_output,
                             "coll:han:comm_query (%d/%s): priority too low; disqualifying myself",
                             comm->c_contextid, comm->c_name);

ompi/mca/coll/sm/coll_sm_module.c

@@ -180,10 +180,10 @@ mca_coll_sm_comm_query(struct ompi_communicator_t *comm, int *priority)
     /* Get the priority level attached to this module. If priority is less
      * than or equal to 0, then the module is unavailable. */
     *priority = mca_coll_sm_component.sm_priority;
-    if (mca_coll_sm_component.sm_priority <= 0) {
+    if (mca_coll_sm_component.sm_priority < 0) {
         opal_output_verbose(10, ompi_coll_base_framework.framework_output,
                             "coll:sm:comm_query (%d/%s): priority too low; disqualifying myself", comm->c_contextid, comm->c_name);
-	return NULL;
+        return NULL;
     }
 
     sm_module = OBJ_NEW(mca_coll_sm_module_t);