A plugin might be disabled by default for other reasons than being
experimental, e.g. because it is not expected to be needed by the
average user. This is probably becoming more relevant the more plugins
are added, since we want to keep the start-up time reasonable.

Change-Id: I87927596d5c78e14793c5e8d6f0548eff6b58d59
Reviewed-by: hjk <qthjk@ovi.com>