deploy: remove cluster-driver-registrar, use kustomize

Developers are expected to modify the files under deploy/kustomize
instead of deploy/kubernetes-1.13/pmem-csi-direct.yaml and
deploy/kubernetes-1.13/pmem-csi-lvm.yaml, then run "make kustomize".
Users deploy exactly as before.

This solves several issues:
- the RBAC rules are derived automatically from the upstream files,
  with documented transformations
- reduced code duplication
- clear definition of what distinguishes the different variants
- opens the path towards adding more variants or kustomization (sic!)
  by admins

"pmem-csi-" is used as prefix more often than just "pmem-". The goal
is reserve "pmem-" for anything related to PMEM and "pmem-csi-" for
the driver.

cluster-driver-registrar gets removed. It has been deprecated
upstream in favor of creating the CRD objects as part of the
installation.

Makefile

@@ -73,3 +73,38 @@ clean:
 include test/clear-kvm.make
 include test/start-stop.make
 include test/test.make
+
+
+
+# We generate deployment files with kustomize and include the output
+# in the git repo because not all users will have kustomize or it
+# might be an unsuitable version. When any file changes, update the
+# output.
+KUSTOMIZE_INPUT := $(shell find deploy/kustomize -type f)
+KUSTOMIZE_OUTPUT :=
+KUSTOMIZE_OUTPUT += deploy/kubernetes-1.13/pmem-csi-direct.yaml
+KUSTOMIZATION_deploy/kubernetes-1.13/pmem-csi-direct.yaml = deploy/kustomize/kubernetes-1.13-direct
+KUSTOMIZE_OUTPUT += deploy/kubernetes-1.13/pmem-csi-lvm.yaml
+KUSTOMIZATION_deploy/kubernetes-1.13/pmem-csi-lvm.yaml = deploy/kustomize/kubernetes-1.13-lvm
+kustomize: $(KUSTOMIZE_OUTPUT)
+$(KUSTOMIZE_OUTPUT): _work/kustomize $(KUSTOMIZE_INPUT)
+	$< build $(KUSTOMIZATION_$@) >$@
+
+# Build kustomize at a certain revision. Depends on go >= 1.12
+# because we use module support.
+KUSTOMIZE_VERSION=177297c0efb92ec2d7eea8f20c65c1d11c6ae7ef
+_work/kustomize: _work/.kustomize-$(KUSTOMIZE_VERSION)-stamp
+_work/.kustomize-$(KUSTOMIZE_VERSION)-stamp:
+	tmpdir=`mktemp -d` && \
+	trap 'rm -r $$tmpdir' EXIT && \
+	cd $$tmpdir && \
+	echo "module foo" >go.mod && \
+	go get sigs.k8s.io/kustomize@$(KUSTOMIZE_VERSION) && \
+	go build -o $(abspath _work/kustomize) sigs.k8s.io/kustomize && \
+	touch --reference=$(abspath _work/kustomize) $(abspath $@)
+
+PHONY: clean-kustomize
+clean: clean-kustomize
+clean-kustomize:
+	rm -f _work/kustomize
+	rm -f _work/.kustomize-$(KUSTOMIZE_VERSION)-stamp