General: store command customization in handlers configuration.

FreeBSD-specific: getent doesn't exist, just use /etc/password and awk
--- handlers/pgsql.in.orig	Wed Dec  5 00:05:41 2007
+++ handlers/pgsql.in	Wed Dec  5 00:07:59 2007
@@ -7,6 +7,9 @@
 getconf databases all
 getconf compress yes
 getconf vsname
+getconf PGSQLDUMP /usr/bin/pg_dump
+getconf PGSQLDUMPALL /usr/bin/pg_dumpall
+getconf PGSQLUSER postgres
 
 localhost=`hostname`
 
@@ -64,7 +67,7 @@
 if [ $usevserver = yes ]; then
    pguid=`$VSERVER $vsname exec getent passwd $PGSQLUSER | @AWK@ -F: '{print $3}'`
 else
-   pguid=`getent passwd $PGSQLUSER | @AWK@ -F: '{print $3}'`
+   pguid=`@AWK@ -F: "/$PGSQLUSER/ "'{print $3}' < /etc/passwd`
 fi
 [ -n "$pguid" ] || \
     fatal "No user called $PGSQLUSER`[ $usevserver = no ] || echo \" on vserver $vsname\"`."