Add schema to task result.
Add schema to task result.

From working on the Java client, I think it's easier if this RPC also returned
the schema.

Change-Id: Ic17578e9dd8dee46e96b4f115d050db789c32df4
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5966
Tested-by: jenkins
Reviewed-by: Nong Li <99a5e5f8f5911755b88e0b536d46aafa102bed41@cloudera.com>

cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice,cloudera/recordservice