Merge pull request #76 from martinb3/master

Add cop ignore for AbcSize
Add test for bad data bags behavior

This test adds an unrelated encrypted data bag, with unencrypted lumberjack keypairs, reproducing the issue described in https://github.com/rackspace-cookbooks/elkstack/issues/77.
Force missing/bad data bag to throw an exception

By accessing data bags, they will raise the intended exception and handling logic we wanted in the first place.

Fixes https://github.com/rackspace-cookbooks/elkstack/issues/77.