Add extension point for impersonate app
Add extension point for impersonate app

This is required as the ajax call made
in the update function was happening too
early and hence the impersonate icons were
not able display on the users page.

Signed-off-by: Sujith H <f003c101b6db321bb70f3b324d211f3cd092837a@owncloud.com>

pollopolea/core,owncloud/core,owncloud/core,pollopolea/core,owncloud/core,pollopolea/core,phil-davis/core,pollopolea/core,owncloud/core,owncloud/core,pollopolea/core