Retry logic when submitting to Core

[michael-iglesias]

Hash Submission to core retry.

• Resolves the issue of hashesObj being deleted from RocksDB upon being read, this will essentially create undelivered hashObjs if the submission to Core fails
• coreRequestAsync() method which accepts a 'options' parameter can now handle optional nested property 'misc'
• Aggregator.js -> coreRequestAsync() now provides a 'misc' property which is a nested object that contains a 'retries' key set to 0
• We don't want to attempt HTTP request retries from within Aggregator.js for Core Requests because hashes that failed to be submitted to Core because they are essentially re-queued and retried at the Aggregation interval