AST-2014-018 - func_db: DB Dialplan function permission escalation via AMI.

AST-2014-018 - func_db: DB Dialplan function permission escalation via AMI.

The DB dialplan function when executed from an external protocol (for instance
AMI), could result in a privilege escalation.

Asterisk now inhibits the DB function from being executed from an external
interface if the live_dangerously option is set to no.

ASTERISK-24534
Reported by: Gareth Palmer
patches: submitted by Gareth Palmer (license 5169)
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Merged revisions 428331 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 428363 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 428409 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@428413 65c4cc65-6c06-0410-ace0-fbb531ad65f3