v0.8.0-alpha.3: Release controller: patches are applied on the owning release only

Since the moment of introduction of Patch interface, release controller
and strategy executor in particular started using `Patch.Alters()`
method in order to distinguish altering patches from no-op. It turned
out there was an inconsistency between the recepient and the validation objects.
In essense, we were checking if a patch alters a predecessor release object
whereas on a positive check it was sent to alter the successor release. This
patch ensures all patches are validated against the same generation of releases.

Signed-off-by: Oleg Sidorov <[email protected]>