cli.c: Properly initialize debug_modules and verbose_modules.

This avoids some lock errors on the core set {debug,verbose} commands.
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Merged revisions 386049 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 386051 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@386054 f38db490-d61c-443f-a65b-d21fe96a405b