Update sample cdr_tds configuration to try and eliminate some confusion.

Also change the preferred configuration option from 'hostname' (which was
misleading because it didn't actually treat the value as a hostname) to
'connection' and added some verbage explaining that the user would need to
refer to their freetds.conf file for those settings.  'hostname' was kept
as a backwards compatible configuration parameter.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@202887 65c4cc65-6c06-0410-ace0-fbb531ad65f3