Refs trac:4682 - This commit fixes c_flush test failure in the ibm test suite for Portals 4 OSC

cmr=v1.8.2:reviewer=tkordenbrock:subject=Move r32112 to v1.8.2 branch

This commit was SVN r32112.

The following SVN revisions from the original message are invalid or
inconsistent and therefore were not cross-referenced:
  r32112

The following Trac tickets were found above:
  Ticket 4682 --> https://svn.open-mpi.org/trac/ompi/ticket/4682

ompi/mca/osc/portals4/osc_portals4_comm.c

@@ -886,7 +886,7 @@ ompi_osc_portals4_get_accumulate(void *origin_addr,
                               NULL,
                               0,
                               NULL,
-                              ptl_op,
+                              PTL_SWAP,
                               ptl_dt);
                 sent += msg_length;
             } while (sent < length);