Set owner field correctly in getTasksStatus call

Was incorrectly setting the identity field instead of the owner field in getTasksStatus call.

Testing Done:
Tested on local laptop using ./gradlew run.
Verified logs.
Looked at client code in test_status.py to ensure we are making the backend call correctly.

Bugs closed: AURORA-373

Reviewed at https://reviews.apache.org/r/21020/