Rename kg_mem_report to kg_usage_mem_report.

Change-Id: I349bb77a5eb4352ec7a1e7888cdc3c03e81450b4
Rename kg_institute_trends.

Change-Id: Iafd0bc863c760d6cd823c93c31c237a696253858
Rename kg_top_users to kg_usage_top_users.

Change-Id: I2b90197af733f76d6c3b75eee49937cf61c40992
Update top_users.

Change-Id: I505cce45672b1148cd91eaa2a6f28184b6868bb8