Enable listening on specific interfaces
If you wish for ntp to listen on specific interfaces, instead of leaving it to the daemon's defaults, then:
1) either set the environment/node attribute ["ntp"]["listen"] to the specific value you want it to be
2) or set the environment/node attribute ["ntp"]["listen_network"] to one of the following:
    - "all"       sets the daemon to listen on "0.0.0.0"
    - "localhost" sets the daemon to listen on "127.0.0.1"
    - "primary"   sets the daemon to listen on node["ipaddress"]
    - a CIDR like "192.168.4.0/24" will set the daemon to listen on any server address found that matches that CIDR
Remove unnecessary logging
Simplify listen_network wrapper and add README note
Fix README merge conflict
Improve CIDR interface search, fix rubocop errors, correct README
Added unit tests for COOK-3604
Ensure that ntp['listen'] always beats ntp['listen_network'] if set
Merge pull request #29 from odyssey4me/more-secure-listen

[COOK-3604] Enable listening on specific interfaces