VMM/common: Improve search_address complexity
Checking the dictionary (a hash) for existence of a key is likely to be
O(log(n)), while checking a list is O(n). Therefore, to increase
performance, this patch changes the check accordingly.
# 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 gid FROM postfix_gid WHERE domainname='%d'