Make the upload code self-healing

[coryrwest]

There are certain error messages we get from the B2 api that point to a resolvable issue (such as needing a new uploadUrl).

Errors that indicate that we need a new uploadUrl

• Request Timeout (408)
• Any 5xx error
• Too Many Requests (429)
• Unauthorized (401) and an error code of expired_auth_token
• Broken pipe

When one of the above errors happens do the following internally:

• Get new UploadUrl or get new Auth Token
• Try upload again