IMPALA-1310: Revert parquet file size change temporarily

The parquet writer makes assumptions about having enough space
per column that is not necessarily true for wide tables. Until
I make a real fix for this, revert the parquet file size change
so that the test does not fail.

Change-Id: Ib8199c68fe256ee5e04f81352ab708a8a91c49d9
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4540
Reviewed-by: Nong Li <nong@cloudera.com>
Tested-by: jenkins