IMPALA-548: Allow lzo index files to end with .INDEX

Change-Id: I3c136f99277ee8b7c801c1f6e88edb682cf84132
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/3721
Reviewed-by: Marcel Kornacker <marcel@cloudera.com>
Tested-by: jenkins
(cherry picked from commit 637e4a5efc47f6a567d5d2d56973f664b9c39964)
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/3795
Reviewed-by: Henry Robinson <henry@cloudera.com>