VMM/cli: w_err() call os.sys.exit only if code != 0.
read_pass() write errors to stderr. And a few other small fixes.
# 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'