Add defmember feature description to man page.

Signed-off-by: Philippe Gregoire <philippe.gregoire@cea.fr>

--- new1/opensm.8	2007-05-15 15:52:09.000000000 +0200
+++ new2/opensm.8	2007-05-15 15:56:08.000000000 +0200
@@ -290,13 +290,15 @@
 
 Partition Definition:
 
-[PartitionName][=PKey][,flag[=value]]
+[PartitionName][=PKey][,flag[=value]][,defmember=full|limited]
 
  PartitionName - string, will be used with logging. When omitted
                  empty string will be used.
  PKey          - P_Key value for this partition. Only low 15 bits will
                  be used. When omitted will be autogenerated.
  flag          - used to indicate IPoIB capability of this partition.
+ defmember=full|limited - specifies default membership for port guid
+                 list. Default is limited.
 
 Currently recognized flags are:
 
@@ -354,6 +356,15 @@
  YetAnotherOne = 0x300 : SELF=full ;
  YetAnotherOne = 0x300 : ALL=limited ;
 
+ ShareIO = 0x80 , defmember=full : 0x123451, 0x123452;
+ # 0x123453, 0x123454 will be limited
+ ShareIO = 0x80 : 0x123453, 0x123454, 0x123455=full;
+ # 0x123456, 0x123457 will be limited
+ ShareIO = 0x80 : defmember=limited : 0x123456, 0x123457, 0x123458=full;
+ ShareIO = 0x80 , defmember=full : 0x123459, 0x12345a;
+ ShareIO = 0x80 , defmember=full : 0x12345b, 0x12345c=limited, 0x12345d;
+
+
 Note:
 
 The following rule is equivalent to how OpenSM used to run prior to the
