bundle-spec: properly identify changegroup-less bundle It is possible to produce a bundle without changegroup. For example if we want to only send phases or obsolescence information. However that lead to crash for command that identifies bundle content. So we fix that. The test will come in the next changesets, when we fix another bug preventing to generate such bundle by hand.

perf: create the temporary target next to the source in stream-consume See inline comment for rational.

setup: display return code information about failed `hg` call This help to understand what is going wrong when things goes wrong.

bundlespec: rationalize the way we specify stream bundle version Instead of having weird dedicated option for each version (v2, v3, etc) we reuse the same "stream" parameters. This is consistent with the ability to request a stream clone using "none-v2;stream=v2". This changeset introduce no user visible change, this is pure internal cleaning.

bundle: do no check the changegroup version if no changegroup is included We don't need to check the compatibility of something we will not use. In practice this was getting in the was of `streamv2` bundles on a narrow repository as the 'cg.version=02' value was rejected by this checks.

perf-stream-consume: use the source repository config when applying This might contains critical configuration for the benchmark, like enabling of extensions like narrow.

unbundle: move most of the logic on cmdutil to help debug::unbundle reuse This make sure `hg debug::unbundle` focus on the core logic.