key_file should be

According to https://azure.microsoft.com/en-us/documentation/articles/cloud-services-python-how-to-use-service-management/ key_file should be '/path/to/azure_cert.pem'
azure_cert.cer raises ssl.SSLError: [SSL] PEM lib (_ssl.c:2580) error.

Closes #611

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
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