upgrade terraform provider openstack to v3.0.0 major (#688)

Fixes #687.

- **Change version and make tfgen**
- **make build_sdks**

.ci-mgmt.yaml

@@ -1,5 +1,5 @@
 provider: openstack
-major-version: 4
+major-version: 5
 env:
   OS_AUTH_URL: "https://auth.cloud.ovh.net/v3/"
   OS_IDENTITY_API_VERSION: 3

Makefile

@@ -3,7 +3,7 @@
 PACK := openstack
 ORG := pulumi
 PROJECT := github.com/$(ORG)/pulumi-$(PACK)
-PROVIDER_PATH := provider/v4
+PROVIDER_PATH := provider/v5
 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 ?= 4.0.0-alpha.0+dev
+PROVIDER_VERSION ?= 5.0.0-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)")