Cleanup CDR resources on exit.

Cleanup CDR resources on exit.

* Simplify do_reload() return handling since it never returned anything
other than 0.

(issue ASTERISK-20649)
Reported by: Corey Farrell
Patches:
      cdr-cleanup-1_8.patch (license #5909) patch uploaded by Corey Farrell
      cdr-cleanup-10-11-trunk.patch (license #5909) patch uploaded by Corey Farrell
      Modified
........

Merged revisions 377069 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 377070 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@377071 65c4cc65-6c06-0410-ace0-fbb531ad65f3