API Ensure that flush and dev/build are performed correctly on multi-node instances
In environments (such as a 3-node cluster) DB operations should not be performed on all nodes simultaneously. This fix uses :once to limit this to one server, but ensures that all servers are still adequately flushed.
Merge pull request #29 from tractorcow/pulls/3-node-b

API Ensure that flush and dev/build are performed correctly on multi-node instances
API Better logging of curl errors during smoketesting