Fix jitter buffer log file creation

This adjusts '/'-to-'#' replacement to replace all instances of '/'
instead of just the first to ensure that the jitter buffer log file
gets the correct name as per Richard Kenner's suggestion.

(closes issue ASTERISK-21036)
Reported by: Richard Kenner
........

Merged revisions 399402 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@399403 f38db490-d61c-443f-a65b-d21fe96a405b