Merge branch 'cc/codespeed'

"perf" test output can be sent to codespeed server. * cc/codespeed: perf/run: read GIT_PERF_REPO_NAME from perf.repoName perf/run: learn to send output to codespeed server perf/run: learn about perf.codespeedOutput perf/run: add conf_opts argument to get_var_from_env_or_config() perf/aggregate: implement codespeed JSON output perf/aggregate: refactor printing results perf/aggregate: fix checking ENV{GIT_PERF_SUBSECTION}