KAZOO-3062 add tags and hidden to records
KAZOO-3062 tags on amqp_connections
KAZOO-3062 gen_listener options to connect to a specific broker or
broker with tag.
KAZOO-3062 add channel_requisition
KAZOO-3062 added AMQP_HIDDEN_TAG definition
KAZOO-3062 corrections, tips & improvements
KAZOO-3062 filter by tag correction
KAZOO-3062 pull request changes. 
brokers_with_tag and brokers_for_zone return list of connections
broker_with_tag and broker_for_zone return the broker if available
KAZOO-3062 list comprehension for filtering
db conflict acquiring fax job
Merge pull request #601 from 2600hz/KAZOO-3062

KAZOO-3062
KAZOO-1556: If pivot server is unreachable fallback to the next children