cdr.c: Make turning on CDR debug a one step process instead of two.

Now "cdr set debug on" doesn't also require "core set verbose 1" to see
CDR debug output.
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Merged revisions 424941 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 424942 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@424943 65c4cc65-6c06-0410-ace0-fbb531ad65f3