VMM//{,cli/}Handler: Reworked configuration related parts.
Renamed attributes _Cfg -> _cfg; _cfgFileName -> _cfg_fname. Renamed methods
__chkCfgFile -> __check_cfg_file; __findCfgFile -> __find_cfg_file. Added
missing docstrings.
# 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 destination FROM postfix_alias WHERE address='%s'