- iax2-provision was not freeing iax_templates structure when unloading the chan_iax2...

- iax2-provision was not freeing iax_templates structure when unloading the chan_iax2.so module.
- Move the code to start using the LIST macros.

Review: http://reviewboard.digium.com/r/72

(closes issue #13232)
Reported by: eliel
Patches:
      iax2-provision.patch.txt uploaded by eliel (license 64)
      (with minor changes pointed by Mark Michelson on review board)
Tested by: eliel

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@160663 65c4cc65-6c06-0410-ace0-fbb531ad65f3