contrib/asv.conf.json

tests: perform a shallow copy instead of a deep copy

Python 3 can't perform a deep copy because it looks like symbols
in the locals() namespace are not deep-copyable. For the curious,
somehow the deepcopy() is attempting to copy objects attached to
the unittest.* functions for the running test!

We don't use deepcopy() anywhere in the code base and a shallow
object copy should be sufficient to test lock copying.

Actually, I'm not sure why we even test this, as I couldn't find
copy.copy() being used for lock copying either. Who knows.

Differential Revision: https://phab.mercurial-scm.org/D5770

{
    "version": 1,
    "project": "mercurial",
    "project_url": "https://mercurial-scm.org/",
    "repo": "..",
    "branches": ["default", "stable"],
    "environment_type": "virtualenv",
    "show_commit_url": "https://www.mercurial-scm.org/repo/hg/rev/",
    "benchmark_dir": "benchmarks",
    "env_dir": "../.asv/env",
    "results_dir": "../.asv/results",
    "html_dir": "../.asv/html"
}