Fix remaining tests to reflect the debug adapter refactoring changes.

Fix Flask and Django multiprocess tests.

Fix test logs not being captured by pytest.

Fix "import debug_me" check improperly applied in tests where it is unnecessary.

Fix some clarifying patterns not respecting the underlying pattern.

Add pattern helpers for strings: starting_with, ending_with, containing.

Move DAP test helpers to a separate module, and add a helper for frames.

Add support for line markers when setting breakpoints and matching frames.

Assorted test fixes around handling of Unicode and paths.

tox.ini

@@ -5,4 +5,4 @@ envlist = py{27,34,35,36,37}
 deps = -rtests/requirements.txt
 passenv = PTVSD_LOG_DIR
 commands =
-    pytest {posargs:-n32}
+    pytest {posargs:-n8}