* Change 'updater' to 'lastModifier' in webhook
Both eventing and serving curretly use lastModifier. Nothing seems to
implement the pkg 'HasSpec' interface yet so this should be a safe
change. This brings the annotation in-line with currentb behavior
Fixes#511
* Remove unnecessary defer
* Change paths in json patches
* #457 Duck type user annotation logic
* #457 Duck type user annotation logic - tests
* #457 Revert updater annotation key from lastModifier to updater
* #457 Rename HasSpec#GetSpec() to HasSpec#GetUntypedSpec()
* #457 Fix some indentation
* #457 Get group for user info annotations from the request
* #457 Reduce confusuion in webhook testing by using same group