Verify that decrypt will succeed for a message with MAX_FRAME_NUMBER of frames

[seebees]

See: https://github.com/aws/aws-encryption-sdk-java/blob/master/src/main/java/com/amazonaws/encryptionsdk/internal/FrameDecryptionHandler.java#L153

It appears that if a message has MAX_FRAME_NUMBER the decrypt will fail.

[lavaleri]

+1

See specification at https://github.com/awslabs/aws-encryption-sdk-specification/blob/master/data-format/message-body.md#sequence-number-1
Sequence number is allowed to be the number of frames, and the number of frames includes MAX_FRAME_NUMBER

Additionally, it looks like the SDK as is will allow creating messages where MAX_FRAME_NUMBER is the last sequence number of a message, but will fail to decrypt such messages.