Add IntentFilter auto verification - part 5

- optimize IntentFilter verification: dont do stuff we dont want
if we dont need to do them.

- improve IntentFilter candidates filtering and also improve
at the same time fix for bug #20128771: we can return the candidates
list rigth the way if the Intent is not related to a Web data URI and
include the "undefined verification state" ones if the first filtering
pass does not leave any.

Change-Id: I19f5c060f58b93530e37b4425d19ed23d2a0f4c0