Fix RSA credential checking in Azure.
Fix RSA credential checking in Azure.

https://trello.com/c/dPU6GsGT/204-improve-supported-azure-rsa-key-format
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wwitzel3/awx,wwitzel3/awx,snahelou/awx,snahelou/awx,wwitzel3/awx,snahelou/awx,wwitzel3/awx,snahelou/awx