reflect latest struct changes
use correct discovery openapi test data layout
make the OpenAPIv3 interface less blue
field grouping
add copyrights
implement cached discovery client
add cached discovery tests
address review feedback
Kubernetes-commit: 075866b3e3ea029c243d82d8d6eb99e96d9c49d3
ServerResources function was deprecated and instead ServerGroupsAndResources
function is suggested.
This PR removes ServerResources function and move every place to use ServerGroupsAndResources.
Kubernetes-commit: ef39a8914291ba200bd5486c88a7575ffd4b7d1d