discovery: make revlogdag work on filtered repo The revlogdag class is a core part of discovery. We need its initialisation to exclude revision filtered out.

pull: run findcommon incoming on unfiltered repo The discovery is not yet ready for filtered repo. Pull was using filtered for its discovery which is wrong. It worked by dumb luck because discovery mainly use funtion that does not respect the filtering. Trying to makes discovery work on filtered repo revealed this bug.

push: more robust check for bundle fast path When all changesets in the local repo are either being pushed or remotly known, we can take a fast path when bundling changeset because we are certain all local deltas are computed againts base known remotely. So we have a check to detect this situation, when we did a bare push and nothing was excluded. In a coming refactoring, the discovery will run on filtered view and the content of `outgoing.excluded` will just include unserved (secret) changeset not filtered by the repoview used to call push (usually "visible"). So we need to check if there is both no excluded changeset and nothing filtered by the current repoview.