common/ugni: help out knl with aries

The way the gni btl is currently coded,
it will run completely out of gas on KNL at
123 processes/node.  Since there are bound to be
those who try to run a MPI process/hyperthread
on KNL nodes, the fma sharing mode needs to be requested.

merge from open-mpi/ompi#1799

Signed-off-by: Howard Pritchard <[email protected]>
(cherry picked from commit open-mpi/ompi@8b53487)

Author: hppritcha

opal/mca/common/ugni/common_ugni.c

@@ -258,7 +258,8 @@ int opal_common_ugni_init (void)
     /* Create a communication domain */
 
     modes = GNI_CDM_MODE_FORK_FULLCOPY | GNI_CDM_MODE_CACHED_AMO_ENABLED |
-            GNI_CDM_MODE_ERR_NO_KILL | GNI_CDM_MODE_FAST_DATAGRAM_POLL;
+            GNI_CDM_MODE_ERR_NO_KILL | GNI_CDM_MODE_FAST_DATAGRAM_POLL |
+            GNI_CDM_MODE_FMA_SHARED;
 
     /* collect uGNI information */
     rc = get_ptag(&opal_common_ugni_module.ptag);