Use AWS CRT instead of cryptography for EC2 decrypt password

[kdaily]

Issue #, if available:

NA

Description of changes:

Replace use of cryptography methods with AWS CRT to perform password decryption when calling the aws ec2 get-password-data command with a supplied private key file.

Testing:

• Existing test suites cover decryption methods, and they pass.
• Manually compared results of retrieving password from the AWS Console for a Windows EC2 instance to the result using the new implementation.

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[hssyoo]

🏆