Upgrade terraform provider rancher2 to v5.0.0 major (#555)

Fixes #547.

Confirming with upstream: there are lots of schema changes, but these
removals reflect the upstream provider.

- **update version, add replaces, make tfgen**
- **Generate SDK**

.ci-mgmt.yaml

@@ -1,5 +1,5 @@
 provider: rancher2
-major-version: 6
+major-version: 7
 setup-script: testing/setup.sh
 env:
   RANCHER_INSECURE: "true"

.pulumi-java-gen.version

@@ -1 +1 @@
-0.15.0
+0.16.0

Makefile

@@ -3,7 +3,7 @@
 PACK := rancher2
 ORG := pulumi
 PROJECT := github.com/$(ORG)/pulumi-$(PACK)
-PROVIDER_PATH := provider/v6
+PROVIDER_PATH := provider/v7
 VERSION_PATH := $(PROVIDER_PATH)/pkg/version.Version
 TFGEN := pulumi-tfgen-$(PACK)
 PROVIDER := pulumi-resource-$(PACK)
@@ -16,7 +16,7 @@ PULUMI_MISSING_DOCS_ERROR := true
 
 # Override during CI using `make [TARGET] PROVIDER_VERSION=""` or by setting a PROVIDER_VERSION environment variable
 # Local & branch builds will just used this fixed default version unless specified
-PROVIDER_VERSION ?= 6.0.0-alpha.0+dev
+PROVIDER_VERSION ?= 7.0.0-alpha.0+dev
 # Use this normalised version everywhere rather than the raw input to ensure consistency.
 VERSION_GENERIC = $(shell pulumictl convert-version --language generic --version "$(PROVIDER_VERSION)")