VMM/handler: Updated Handler.user_{disable,enable} methods to
accept a list of services.
man/{,de/}man1/vmm.1.rst: Updated userenable/userdisable part.
# 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 transport FROM postfix_transport WHERE address='%s'