[bug] Guaccollect s3 polling not working

[ANIRUDH-333]

Describe the bug Guaccollect doesn't recognise the poll flag and polling doesn't happen when we don't give any flag. It just ingests the existing artifacts and quits.

To Reproduce Run the following command

guaccollect s3 \
    --blob-addr="s3://test-blobstore?region=us-west-2" \
    --s3-region us-west-2 \
    --s3-url https://s3.us-west-2.amazonaws.com/ \
    --s3-bucket test-artifacts \
    --s3-mp-endpoint https://sqs.us-west-2.amazonaws.com/123234556/test-collect-event \
    --s3-queues test-collect-event \
    --s3-mp sqs

• test-blobstore is the bucket which is used for blobstore
• test-artifacts is the bucket being used to store the artifacts
• test-collect-event is used to listen to the PUT events in test-artifacts bucket

Expected behavior guaccollect is supposed to keep running and should ingest the new artifacts as they are added to the bucket.

GUAC version 0.10.2

[ANIRUDH-333]

On diving deeper into the code, inside guaccollect dir, we found that the s3.go expects poll flag (viper.GetBool("poll")). But the root command uses the service-poll flag. Besides that, s3.go flag set doesn't mention the poll flag. We found that the files.go uses the service-poll flag and when we made that change, it started working. If this change is acceptable, we can contribute for the fix.