phases: simplify phase exchange and movement over pushkey The code now only exchange draft root and only care about movement related to public//draft boundary. There is multiple reason to simplify this code: * Secret are never discovered anymore * We decided to not support more the three existing phase Removing phase index from pushkey (if ever decided) will be made in another commit.

phases: move phase according what was pushed not only what was added added This fix the lack phase movement when a locally secret changeset without added children was pushed to the repository. In such case, this changeset would be present in the bundle source, but not in the ``added`` variable.

revlog: make addgroup returns a list of node contained in the added source This list will contains any node see in the source, not only the added one. This is intended to allow phase to be move according what was pushed by client not only what was added.

phases: make secret changeset undiscoverable in all case This apply the redefined stronger semantic of secret. Secret changeset can still leak in various way. Those leak will need to be fixed individualy

phases: exclude secret when doing a local clone This is achieved by denying copy clone when any secret changeset exist.

bookmarks: primarily use repo lock, not wlock Bookmarks are repository data, not working directory data. Only the current bookmark is working directory data. Some lock shuffling is required to avoid lockout between the initial mock lock and locking of the localrepo instance that is created after copying.

localrepo: update branchcache in a more reliable way test-mq-cache.t did apparently look at stale cache content. Testing with different locking mechanism happened to update the cache more frequently and thus caused a test failure.

tests: make qnew in test-mq-caches.t stable The unstable hashes did for other reasons not show up in the test output.