pushkey: add an ``encode`` function This function is just a shorthand for ``encoding.fromlocal``. It will help hiding the encoding business from other code exchanging pushkey data over the wire.

bundle2: add ``pushkey`` support After ``listkeys`` we can now include ``pushkey`` request in a bundle2. The part uses a very simple scheme closest as possible to the current wireproto command for ``pushkey``. We may eventually decide for a more sophisticated part format before the protocol becomes final.

pushkey: add a ``decode`` function This function is just a shorthand for ``decoding.fromlocal``. It will help hiding the encoding business from other code exchanging pushkey data over the wire.

pull: when remote supports it, pull phase data alongside changesets We use bundle2 to retrieve the remote phase data at the same time as changesets. This reduces the amount of requestis and should improve consistency as the server can ensure nothing changed between the retrieval of those parts.

getbundle: support of listkeys argument when bundle2 is used A new ``listkeys`` is supported by getbundle. It is a list of namespaces whose content should be included in the bundle. An appropriate entry has been added to the wireproto map of getbundle arguments and a new bundle2 capability is advertised. There are still no codes that request such parts in core mercurial.

getbundle: raise error if extra arguments are provided for bundle10 New arguments are most likely to be supported by bundle20 (and above) only.

bundle: introduce a listkey handler This makes it possible to handle listkeys-related data stored in a bundle2. There are no producers yet.

pull: split remote phases retrieval from actual application We want to be able to retrieve phases information through bundle2. The logic to apply remote phases will not change.

wireproto: use pushkey.decodekey

pushkey: introduce an ``decodekeys`` function This function provides a standardized way to exchange pushkey content over the wire.

wireproto: use pushkey.encodekey

pushkey: introduce an ``encodekeys`` function This function provides a standardized way to exchange pushkey content over the wire.

bundle2: add more phase movement in the test To test phase exchange with bundle2 we need some phase movement to happen. Appropriate logging is added to track those changes.

bundle2: use non-publishing repo in test If we are going to test usage of bundle for phases exchange, we need some phase movements to be exchanged.

bundle2: use a smarter template for test We use a more compact template that includes phase information.