phases: properly register excluded changeset when revision are specified

There was no other drawback than a bad UI message for now.

mercurial/discovery.py

@@ -116,7 +116,7 b' def findcommonoutgoing(repo, other, only'
         sets = repo.changelog.findcommonmissing(og.commonheads, onlyheads)
         og._common, allmissing = sets
         og._missing = missing = []
-        og._excluded = excluded = []
+        og.excluded = excluded = []
         for node in allmissing:
             if repo[node].phase() >= phases.secret:
                 excluded.append(node)

tests/test-mq-safety.t

@@ -171,7 +171,7 b' Pushing applied patch with --force'
   $ hg push --force -r default ../forcepush2
   pushing to ../forcepush2
   searching for changes
-  no changes found
+  no changes to push but 1 secret changesets
   $ hg phase -d 'mq()'
   $ hg push --force -r default ../forcepush2
   pushing to ../forcepush2