VMM: Unified parameter names and option names.
handler: Handler.user_delete() renamed parameter:
delete_home -> del_dir
The same as in Handler.domain_delete().
cli/subcommands: renamed userdelete's option
--delete-home -> --delete-directory
So people have to memorize only one option name. It also matches the
setting names of vmm.cfg.
# All parameters are described in pgsql_table(5) / PGSQL PARAMETERS
#
# The hosts that Postfix will try to connect to and query from.
hosts = localhost
# The user name and password to log into the pgsql server.
user = postfix
password = some_password
# The database name on the servers.
dbname = mailsys
# The SQL query template used to search the database
query = SELECT gid FROM postfix_gid WHERE domainname='%s'