PBX: Prevent incorrect hint parsing

Dynamic and pattern matching hints should not be checked for their last
known state until they are instantiated by subscribers.

AFS-56 #close #comment Reported by: John Hardin
AFS-56 #comment Patch AFS-56-pbx.diff submitted by Matt Jordan (license 6283)


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@414813 f38db490-d61c-443f-a65b-d21fe96a405b