tsmclient: Add default value undef for $serveraddress.

The parameter is documented as being optional. However to get the
default behaviour it had to be declared with the empty string as
value.

Signed-off-by: Thomas Bellman <bellman@nsc.liu.se>

manifests/init.pp

@@ -158,7 +158,7 @@
  *    list.
  */
 
-define tsmclient($serveraddress, $nodename=$fqdn,
+define tsmclient($serveraddress=undef, $nodename=$fqdn,
 		 $optoptions=[], $sysoptions=[], $inclexcl=[])
 {
     include tsmclient::install