Add an explicit dep on dns-client to logging-client role.
Fix up typo in logging-client recipe.
Don't install rsyslog if it already exists.
Add server flag to logging-server role.
Merge pull request #67 from VictorLowther/pull-req-master-adf59d76e7c4525496432dae4e35f36b067b56c2

https://github.com/crowbar/barclamp-logging/pull/67

Merged by devtool for cloudedge