Revert "Provide an override level for os-apply-config"

This reverts commit bf95d722f0af7881569f3ccec66fd1a8b6b26669.

I hate to be a wet blanket but this is a workaround for lower layers
of the design not being powerful enough - we'll have to repeat this
for other similar elements, such as nagios, and thats poor - plus
we'll have to support this once its in a release, and thats
undesirable.

Change-Id: I0c1aca7f64e4aa0f60c5c24000282cdaa2678c2b
Merge "Revert "Provide an override level for os-apply-config""