Fix order of SIP allow/disallow in MySQL contrib script.

Using the contrib sippeers.sql script to create the sippeers MySQL table
would result in being unable to place calls if you set the disallow value
to all.

(closes issue ASTERISK-20756)
Reported by: Andre Luis
Patches:
      sippeers.patch patch uploaded by Andre Luis


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@377431 65c4cc65-6c06-0410-ace0-fbb531ad65f3

contrib/realtime/mysql/sippeers.sql

@@ -28,8 +28,8 @@ CREATE TABLE IF NOT EXISTS `sippeers` (
       `callgroup` varchar(40) DEFAULT NULL,
       `pickupgroup` varchar(40) DEFAULT NULL,
       `language` varchar(40) DEFAULT NULL,
-      `allow` varchar(40) DEFAULT NULL,
       `disallow` varchar(40) DEFAULT NULL,
+      `allow` varchar(40) DEFAULT NULL,
       `insecure` varchar(40) DEFAULT NULL,
       `trustrpid` enum('yes','no') DEFAULT NULL,
       `progressinband` enum('yes','no','never') DEFAULT NULL,