Change incorrect chan_sip zombie hangup debug message. They are all zombies now.

........

Merged revisions 369235 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 369236 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@369237 65c4cc65-6c06-0410-ace0-fbb531ad65f3