The validation for the `azurerm_storage_blob` `type` parameter was
checking for `blob` where it should have been `block`
This commits fixes it up
```
make testacc TEST=./builtin/providers/azurerm
TESTARGS='-run=TestResourceAzureRMStorageBlobType_validation'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/azurerm -v
-run=TestResourceAzureRMStorageBlobType_validation -timeout 120m
=== RUN TestResourceAzureRMStorageBlobType_validation
--- PASS: TestResourceAzureRMStorageBlobType_validation (0.00s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/azurerm
0.014s
```
These resources use ARM to get keys for the storage API, but then use
the storage REST API as per the ASM provider. The code is significantly
reworked with better logging and error handling. The key functions can
be reused for queues and file storage resources when they get added.
Paul Stack