3.18: fix conference setting of call and tracking language in whapps_call
KAZOO-3081 - added max_digits parameter to cf_disa configuration
Fixed lookup of int value to get_integer_value and added default pin length
Merge pull request #605 from scratch-wireless/KAZOO-3081

KAZOO-3081 - added max_digits parameter to cf_disa configuration
KAZOO-1556: If pivot server is unreachable fallback to the next children
KAZOO-1556: Adding log line