cdr_csv logging parameters in cdr.conf

 usegmtime, log date/time in GMT
 loguniqueid log uniqueid
 loguserfield log user field
 patch provided by bug 5015


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@11586 65c4cc65-6c06-0410-ace0-fbb531ad65f3