update safe_asterisk script

change defaults to make a little more sense. Default log location is now asterisk log location and default email notification has been changed to root on the local machine

Review: https://reviewboard.asterisk.org/r/1067/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@300761 65c4cc65-6c06-0410-ace0-fbb531ad65f3