add support for named sections in zapata.conf, and fix a few bugs in config file...

add support for named sections in zapata.conf, and fix a few bugs in config file parsing

(closes issue #9503)
Reported by: tzafrir
Patches:
      fix_cleanups uploaded by tzafrir (license 46)
      zapata_sections uploaded by tzafrir (license 46)
      skipchannel_options uploaded by tzafrir (license 46)
      conf_sample uploaded by tzafrir (license 46)

patches updated by me to better conform to coding guidelines and fix some problems

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@108286 65c4cc65-6c06-0410-ace0-fbb531ad65f3