Allow using view locations in cancelled stock moves.

Since changest 29ab3d9bd918 we allow using view locations in draft and staging
moves making it possible to have a warehouse with a view location as main
storage location. But if the user wanted to cancel a shipment with such location
she would have to change the location of all moves before cancelling which is
very annoying.

issue5891
review29531002

move.py

@@ -27,7 +27,7 @@ STATES = {
 }
 DEPENDS = ['state']
 LOCATION_DOMAIN = [
-    If(Eval('state').in_(['staging', 'draft']),
+    If(Eval('state').in_(['staging', 'draft', 'cancel']),
         ('type', 'not in', ['warehouse']),
         ('type', 'not in', ['warehouse', 'view'])),
     ]