Old bundles not properly cleaned up during activation

[ashutosh-narkar]

When OPA downloads a bundle which owns everything (ie. no manifest roots defined) and a bundle is already activated, OPA should delete all the existing data in the store and then write the new data to the store. If the existing bundle also has no manifest roots defined, the cleanup is not happening as expected. For example, if OPA has the following bundle loaded:

Bundle name: foo
Bundle roots: [""]
Bundle revision: rev-1
Bundle data: {"a": "b"}

Now if OPA downloads a new bundle as follows:

Bundle name: foo
Bundle roots: [""]
Bundle revision: rev-2
Bundle data: {"x": "y"}

The expected data in the store should be {"x": "y"} but currently the store has {"x": "y", "a": "b"}.