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=postfixpassword=some_password# The database name on the servers.dbname=mailsys# The SQL query template used to search the databasequery=SELECTdestinationFROMpostfix_relocatedWHEREaddress='%s'