Feature request: Apache Drill connector without S3

Hi,

First of all, thank you all for Falcon. It's awesome.

However, it looks like the Apache Drill connector only works with S3 buckets. Nonetheless, Drill itself is able to query from lots of other places (such as a local filesystem, HDFS, MongoDB...).

Adding generic support for Apache Drill (without the need for S3 credentials) would be great. It would expand Falcon capabilities a lot with just one connector.

Thank you!