Misc. diagnostic/debugging improvements

- Add number of files in table to query plan
- Add number of remote scan ranges to runtime profile
- Clean up logging in ClientCache

Change-Id: I0580fe435ac0a52548aedb4e0ffa875ce9b9dede
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5114
Reviewed-by: Skye Wanderman-Milne <skye@cloudera.com>
Tested-by: jenkins