DLPX-25998 TCP congestion control is inadequate
Reviewed at: http://reviews.delphix.com/r/34808/

@@ -398,10 +398,13 @@
              -p,--prop
                      Specify the property name and value(s).  The optional +|-
                      syntax can be used to add/remove values from the current
                      list of values on the property.  The property name can be
                      one of the following:
+                     congestion_control     The default congestion-control
+                                            algorithm to be used for new
+                                            connections (TCP).
                      ecn                    Explicit congestion control
                                             (never/passive/active) (TCP).
                      extra_priv_ports       Additional privileged ports
                                             (SCTP/TCP/UDP).
                      forwarding             Packet forwarding (on/off).