Update PostgreSQL realtime scripts with schema for queue_log table

This patch updates the realtime SQL scripts with an entry that will create the
queue_log table. This brings the PostgreSQL scripts inline with the MySQL
scripts, with respect to what tables they will create.

(closes issue ASTERISK-21021)
Reported by: Eugene
patches:
  queue_log.sql uploaded by varnav (license 6360)
........

Merged revisions 394896 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 394897 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@394898 65c4cc65-6c06-0410-ace0-fbb531ad65f3