Explicitly reference the bind keys file

Debian supplies the bind keys at /etc/bind/bind.keys and RedHat supplies it at
/etc/named.iscdlv.key. Add the directive that references this file. I think it
may have "just worked" on Debian, baesd on the information at
https://www.isc.org/downloads/bind/bind-keys/

data/osfamily/Debian.yaml

@@ -10,5 +10,6 @@ bind::defaults::namedconf: '/etc/bind/named.conf'
 bind::defaults::cachedir: '/var/cache/bind'
 bind::defaults::logdir: '/var/log/bind'
 bind::defaults::default_zones_include: '/etc/bind/named.conf.default-zones'
+bind::defaults::isc_bind_keys: '/etc/bind/bind.keys'
 
 bind::updater::keydir: '/etc/bind/keys'

data/osfamily/RedHat.yaml

@@ -12,5 +12,6 @@ bind::defaults::cachedir: '/var/named'
 bind::defaults::logdir: '/var/log/named'
 bind::defaults::default_zones_include: '/etc/named.default-zones.conf'
 bind::defaults::default_zones_source: 'puppet:///modules/bind/RedHat/named.default-zones.conf'
+bind::defaults::isc_bind_keys: '/etc/named.iscdlv.key'
 
 bind::updater::keydir: '/etc/named/keys'