discovery: add a devel.discovery.exchange-heads Currently all discovery start with testing local and remote heads. For analysis purpose we make it possible to disable that initial "handshake" and start discovery with the whole repository as undecided. Differential Revision: https://phab.mercurial-scm.org/D9801

test-regression: backing out D9640 (63c923fd7fa8) Since D9640 was pushed, we have seen failure on at least: - test-commit-interactive.t - test-i18n.t - test-log.t The author that change requested it to be removed until he can investigate. For reference: https://phab.mercurial-scm.org/D9640 Backed out changeset 63c923fd7fa8 Differential Revision: https://phab.mercurial-scm.org/D9803

clone: make sure we warm the cache after a clone This work around any deviciency/limitation of the clone process. In our case this ensure the persistent nodemap exist with valid content. Ideally, the cloning process would also do "the right thing". However since older server will never be able to do "the right thing". The local workaround will be necessary anyway. I am not worried by the performance impact of this as `hg clone` is non-instant on large repositories where is could matters. Warming the cache if they are already correct is very fast. And if they are not already warm, this seems like a good time to do so. This impact various test as more cache are now warmed sooner, all the change should be harmless. Differential Revision: https://phab.mercurial-scm.org/D9789