VMM/transport: Reworked Transport initialization.
Set the transport id only if we could find a transport with that id.
Raise a ValueError instead of a translatable TransportError(VMMError).
VMM/errors: Deleted class TransportError, it is no longer needed.
# 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 maildir FROM postfix_maildir WHERE address='%s'