Fixes an issue with the Newchannel AMI event during the Masquerading process.

Fixes an issue with the Newchannel AMI event during the Masquerading process.

Fixes an issue with the Newchannel AMI event during the Masquerading process,
where no Newchannel AMI event was generated for the psuedo channel used during
the masquerading process.

(closes issue #17987)
Reported by: RadicAlish
Patches:
      newchannel.patch.txt uploaded by RadicAlish (license 1122)
      Tested by: RadicAlish

      Review: https://reviewboard.asterisk.org/r/937/

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@289094 65c4cc65-6c06-0410-ace0-fbb531ad65f3