What this PR does / why we need it:
This adds an e2e test for aggregation based on the sample-apiserver.
Currently is uses a sample-apiserver built as of 1.7.
This should ensure that the aggregation system works end-to-end.
It will also help detect if we break "old" extension api servers.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes
fixes #43714
Fixed bazel for the change.
Fixed # of args issue from govet.
Added code to test dynamic.Client.