remove GNI_RDMAMODE_FENCE bit in GNI_PostRdma

The GNI_RDMAMODE_FENCE bit was a left over from
async progress work that is not needed at this point
in the gni BTL.  Removing the bit also allows
for the removal of the GNI_CDM_MODE_BTE_SINGLE_CHANNEL
bit from the GNI_CdmCreate call.

opal/mca/btl/ugni/btl_ugni_rdma.h

@@ -36,7 +36,10 @@ static inline void init_gni_post_desc (mca_btl_ugni_base_frag_t *frag,
     frag->post_desc.base.remote_addr     = (uint64_t) rem_addr;
     frag->post_desc.base.remote_mem_hndl = rem_mdh;
     frag->post_desc.base.length          = bufsize;
+#if 0
     frag->post_desc.base.rdma_mode       = GNI_RDMAMODE_FENCE;
+#endif
+    frag->post_desc.base.rdma_mode       = 0;
     frag->post_desc.base.src_cq_hndl     = cq_hndl;
     frag->post_desc.tries                = 0;
 }

opal/mca/common/ugni/common_ugni.c

@@ -269,9 +269,9 @@ int opal_common_ugni_init (void)
         mca_btl_ugni_component.rdma_max_retries;
 
     /* Create a communication domain */
-    /* TODO - bte single should be removed when the IRQ problem is figured out */
+
     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_BTE_SINGLE_CHANNEL;
+            GNI_CDM_MODE_ERR_NO_KILL | GNI_CDM_MODE_FAST_DATAGRAM_POLL;
 
     /* collect uGNI information */
     rc = get_ptag(&opal_common_ugni_module.ptag);