This adds a generic implementation of a clientset, and uses it to
replace the template code in generated clientsets for the default
methods. The templates are preserved as-is (or as close as they can
be) for use in extensions, whether for resources or subresources.
Clientsets with no extensions are reduced to their main getter, their
interface, their specific struct, and their constructor. All method
implementations are provided by the generic implementation. The
dedicated interface is preserved so that each clientset can have its
own set of methods, and the dedicated struct is preserved to allow
extensions and expansions to be defined where necessary.
Instead of handling the variants (with/without namespace, list, apply)
with a complex sequence of if statements, build up an index into an
array containing the various declarations.
The namespaced/non-namespaced distinction matters in the code
templates, but not in the methods themselves, so drop all the
non-namespaced variants and pass in "" explicitly.
Signed-off-by: Stephen Kitt <skitt@redhat.com>
Kubernetes-commit: 3734f5bf9b6ce1e9cf2385f4e4453b32d8f35ab1
