Bugfix/34 bug dma not deleting entry for retries from redis

[kaushalaroraharman]

Resolves #34

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Describe behaviour before the change

• DMA was using vehicleID from the event information when creating key for retry records in Redis. If an event came in with key as something other than vehicleID, then the functionality for retries was not working as expected. Retry records were not being fetched, and deleted upon receiving ACK from the vehicle due to this, leading to unnecessary retries.

Describe behaviour after the change

• DMA will not use the key from the event to form the key for storing retry records in Redis. The functionality of concatenating this with messageID and taskID remains unchanged and unaffected.

Pull request checklist

• I have read the CONTRIBUTING.md
• My code follows the code style of this project
• Tests for the changes have been added (for bug fixes / features)
• All new and existing tests passed.
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

• Yes
• No

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