Correct InstanceNotifier yaml stub

Addition to reviews/113676 (reducing number of api requests during
deploy). InstanceNotifier yaml stub was mistakenly called
InstanceReportNotifier; patch corrects manifest.yaml and the class
name, and renames the yaml file.

Change-Id: I47c143ed92456374936e13bb27ae5988e5676e8e
Closes-Bug: 1358061
Merge "Correct InstanceNotifier yaml stub"