test: fix metaedit tests by forcing dates Mercurial < 4.3 don't have default date so restore aliases forcing date in the test-metaedit.t file.

test: split test-stablesort.t in two This is the longest running test so we split it in two to help with parallel execution.

obsdiscovery: automatically pick protocol in a list This makes the code cleaner, clearer and more flexible. This also prepare the ability to disable obsmarkers discover entirely.

obsdiscovery: extract push-obshashtree discovery in a function This will help use to simplify the code.

obsdiscovery: directly use the 'only' revset for obshashtree The revset now exists and is fast. This remove the needs to hold a reference to "revs" in that code.

obsdiscovery: extract push-obshashrange discovery in a function This will help us to simplify the code. The code is updated to directly use 'outgoing' missing so that is no longer needs to access 'futureheads'.

obsdiscovery: merge two distinct if statement It did not made any sense for them to be split.

obsdiscovery: extract '_canobshashtree' having this as a simple function will help use to generalise the obsdiscovery algorithm we use.

obsdiscovery: move code inserting discovery at the end of the file This makes it easier to reuser function defined earlier in the file.

obsdiscovery: trust core to do the right thing if no discovery is available This is fixed for a long time now.