reject call attempts when gatekeeper is configured but not registered

(closes issue ASTERISK-21800)
Reported by: Dmitry Melekhov
Patches:
        ASTERISK-21800-1.patch
Tested by: Dmitry Melekhov



git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@390181 f38db490-d61c-443f-a65b-d21fe96a405b