Add explicit dependency on dns-client to ntl-client.
Don't try to install ntpd if it is already installed.
Use node.normal instead of node.set.
Add server flag to ntp-server role.
Whitespace cleanup
Merge pull request #39 from VictorLowther/pull-req-master-adf59d76e7c4525496432dae4e35f36b067b56c2

https://github.com/crowbar/barclamp-ntp/pull/39

Merged by devtool for cloudedge
add overlay for ntp-server, needs more work on saving
Merge pull request #41 from cloudedge/pull-req-master-d8017cb3e43d33b986fe906b749188bff709ba7d

https://github.com/crowbar/barclamp-ntp/pull/41

Merged by devtool for VictorLowther