cli.c: Properly initialize debug_modules and verbose_modules.

This avoids some lock errors on the core set {debug,verbose} commands.
........

Merged revisions 386049 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@386051 f38db490-d61c-443f-a65b-d21fe96a405b