mach py2

    android
    android-emulator
    awsy-test
    browsertime
    cargo
    check-spidermonkey
    clang-format
    cppunittest
    cramtest
    crashtest
    devtools-css-db
    file-info
    firefox-ui-functional
    geckodriver
    geckodriver-test
    geckoview-junit
    gradle
    gtest
    hazards
    ide
    jsapi-tests
    jsshell-bench
    jstestbrowser
    jstests
    marionette-test
    mochitest
    mozharness
    pastebin
    power
    prettier-format
    puppeteer-test
    python
    python-test
    raptor
    raptor-test
    reftest
    release
    release-history
    remote
    repackage
    robocop
    rusttests
    static-analysis
    talos-test
    taskcluster-build-image
    taskcluster-load-image
    taskgraph
    telemetry-tests-client
    test
    test-info
    tps-build
    valgrind-test
    visualmetrics
    web-platform-tests
    web-platform-tests-update
    webidl-example
    webidl-parser-test
    webrtc-gtest
    wpt
    wpt-manifest-update
    wpt-metadata-merge
    wpt-metadata-summary
    wpt-serve
    wpt-test-paths
    wpt-unittest
    wpt-update
    xpcshell-test