btl/usnic: set retrans_timeout back down to 5ms

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
(cherry picked from commit 3080033)

Author: jsquyres

opal/mca/btl/usnic/btl_usnic_mca.c

@@ -257,7 +257,7 @@ int opal_btl_usnic_component_register(void)
     mca_btl_usnic_component.udp_port_base = (int) udp_port_base;
 
     CHECK(reg_int("retrans_timeout", "Number of microseconds before retransmitting a frame",
-                  100000, &mca_btl_usnic_component.retrans_timeout,
+                  5000, &mca_btl_usnic_component.retrans_timeout,
                   REGINT_GE_ONE, OPAL_INFO_LVL_5));
 
     CHECK(reg_int("max_resends_per_iteration", "Maximum number of frames to resend in a single iteration through usNIC component progress",