The Confluence Like plugin cannot be disabled in OnDemand instances

Our official documentation for the Confluence like feature instructs users that they may disable the feature if they don't want to use it. This can be done by disabling the Like plugin from the UPM. (see http://confluence.atlassian.com/display/DOC/Likes+and+Popular+Content#LikesandPopularContent-Disablingthelikefeature)

However, for OnDemand users, because the plugin is bundled as a system plugin, users are not able to disable the plugin (in OnDemand, only users with System Administrator permissions are permitted to enable or disable 'system' plugins, and the System Administrator perm is only granted to atlassian support) (see http://confluence.atlassian.com/display/AOD/Restricted+Functions+in+Atlassian+OnDemand#RestrictedFunctionsinAtlassianOnDemand-Confluence).

There is already an existing feature in the UPM that allows the host product to 'override' a plugins listing from 'System' to 'User-Installed', so that users are able to enable and disable it. We should perform this override for the Like plugin, also.