Refactor tests.debug to accommodate ptvsd.server spawning the adapter, and remove the need for "custom_client" and "custom_server" start methods.

Fix launcher not propagating debuggee exit code.

Fix attach-by-PID without explicit --log-dir overriding PTVSD_LOG_DIR (and disabling logging).

Improve test logging, with a separate directory for every test.

Various test fixes.

tests/test_data/attach/attach1.py

@@ -1,29 +0,0 @@
-from debug_me import backchannel, ptvsd, scratchpad
-
-import os
-import time
-
-ptvsd.enable_attach(("localhost", int(os.environ["ATTACH1_TEST_PORT"])))
-
-if int(os.environ["ATTACH1_WAIT_FOR_ATTACH"]):
-    backchannel.send("wait_for_attach")
-    ptvsd.wait_for_attach()
-
-if int(os.environ["ATTACH1_IS_ATTACHED"]):
-    backchannel.send("is_attached")
-    while not ptvsd.is_attached():
-        print("looping until is_attached")
-        time.sleep(0.1)
-
-if int(os.environ["ATTACH1_BREAK_INTO_DEBUGGER"]):
-    backchannel.send("break_into_debugger?")
-    assert backchannel.receive() == "proceed"
-    ptvsd.break_into_debugger()
-    print("break")  # @break_into_debugger
-else:
-    scratchpad["paused"] = False
-    backchannel.send("loop?")
-    assert backchannel.receive() == "proceed"
-    while not scratchpad["paused"]:
-        print("looping until paused")
-        time.sleep(0.1)

tests/test_data/django1/app.py

@@ -1,3 +1,5 @@
+import debug_me  # noqa
+
 import os
 import signal
 import sys