Adds support for uploading blobs to azure storage from local source

[ryanmoran]

• adds "source", "parallelism", and "attempts" fields
• supports both block and page type blobs
• uploads run concurrently
• page blobs skip empty byte ranges to efficiently upload large sparse
  files
• "source" expects an absolute path to a file on the local file
  system
• "parallelism" expects an integer value that indicates the number of
  workers per CPU core to run for concurrent uploads
• "attempts" expects an integer value for number of attempts to make per
  page or block when uploading

[stack72]

Hi @ryanmoran

This is a great PR - thanks so much for the work here :)

I am going to manually merge this - it needs a few pieces of documentation to help the users out :)

% make testacc TEST=./builtin/providers/azurerm TESTARGS='-run=TestAccAzureRMStorageBlob'
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/08/08 15:21:30 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/azurerm -v -run=TestAccAzureRMStorageBlob -timeout 120m
=== RUN   TestAccAzureRMStorageBlob_basic
--- PASS: TestAccAzureRMStorageBlob_basic (214.46s)
=== RUN   TestAccAzureRMStorageBlobBlock_source
--- PASS: TestAccAzureRMStorageBlobBlock_source (283.22s)
=== RUN   TestAccAzureRMStorageBlobPage_source
--- PASS: TestAccAzureRMStorageBlobPage_source (347.04s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/azurerm    844.734s

Paul

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