refactor: enable QA tests and jafar self test (#208)

* refactor: enable QA tests and jafar self test

Part of https://github.com/ooni/probe/issues/1335

* chore: make sure all workflows run on release branches

internal/engine/QA/common.py

@@ -1,72 +0,0 @@
-""" ./QA/common.py - common code for QA """
-
-import contextlib
-import json
-import os
-import shlex
-import shutil
-import socket
-import subprocess
-import sys
-import time
-import urllib.parse
-
-
-def execute(args):
-    """ Execute a specified command """
-    subprocess.run(args)
-
-
-def execute_jafar_and_miniooni(ooni_exe, outfile, experiment, tag, args):
-    """ Executes jafar and miniooni. Returns the test keys. """
-    tmpoutfile = "/tmp/{}".format(outfile)
-    with contextlib.suppress(FileNotFoundError):
-        os.remove(tmpoutfile)  # just in case
-    execute(
-        [
-            "./jafar",
-            "-main-command",
-            "./QA/minioonilike.py {} -n -o '{}' --home /tmp {}".format(
-                ooni_exe, tmpoutfile, experiment
-            ),
-            "-main-user",
-            "nobody",  # should be present on Unix
-            "-tag",
-            tag,
-        ]
-        + args
-    )
-    shutil.copy(tmpoutfile, outfile)
-    result = read_result(outfile)
-    assert isinstance(result, dict)
-    assert isinstance(result["test_keys"], dict)
-    return result["test_keys"]
-
-
-def read_result(outfile):
-    """ Reads the result of an experiment """
-    return json.load(open(outfile, "rb"))
-
-
-def test_keys(result):
-    """ Returns just the test keys of a specific result """
-    return result["test_keys"]
-
-
-def check_maybe_binary_value(value):
-    """ Make sure a maybe binary value is correct """
-    assert isinstance(value, str) or (
-        isinstance(value, dict)
-        and value["format"] == "base64"
-        and isinstance(value["data"], str)
-    )
-
-
-def with_free_port(func):
-    """ This function executes |func| passing it a port number on localhost
-        which is bound but not listening for new connections """
-    # See <https://stackoverflow.com/a/45690594>
-    with contextlib.closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
-        sock.bind(("127.0.0.1", 0))
-        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        func(sock.getsockname()[1])