Be more strict about Python deprecation warnings again

The warnings caught in earlyinit.py got fixed in the affected dependencies.
The collections.abc warning also seems to be fixed in everything but PyYAML.

pytest.ini

@@ -68,7 +68,5 @@ qt_log_ignore =
 xfail_strict = true
 filterwarnings =
     error
-    # This happens in many qutebrowser dependencies...
-    ignore:Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working:DeprecationWarning
     # WORKAROUND for https://github.com/pytest-dev/pytest-bdd/pull/288
     ignore:the `pytest\.config` global is deprecated\.  Please use `request.config` or `pytest_configure` \(if you're a pytest plugin\) instead\.

qutebrowser/misc/earlyinit.py

@@ -199,25 +199,7 @@ def _check_modules(modules):
 
     for name, text in modules.items():
         try:
-            # https://github.com/pallets/jinja/pull/628
-            # https://bitbucket.org/birkenfeld/pygments-main/issues/1314/
-            # https://github.com/pallets/jinja/issues/646
-            # https://bitbucket.org/fdik/pypeg/commits/dd15ca462b532019c0a3be1d39b8ee2f3fa32f4e
-            messages = ['invalid escape sequence',
-                        'Flags not at the start of the expression']
-            # pylint: disable=bad-continuation
-            with log.ignore_py_warnings(
-                category=DeprecationWarning,
-                message=r'({})'.format('|'.join(messages))
-            ), log.ignore_py_warnings(
-                category=PendingDeprecationWarning,
-                module='imp'
-            ), log.ignore_py_warnings(
-                category=ImportWarning,
-                message=r'Not importing directory .*: missing __init__'
-            ):
-                # pylint: enable=bad-continuation
-                importlib.import_module(name)
+            importlib.import_module(name)
         except ImportError as e:
             _die(text, e)
 

qutebrowser/utils/utils.py

@@ -655,7 +655,15 @@ def expand_windows_drive(path):
 def yaml_load(f):
     """Wrapper over yaml.load using the C loader if possible."""
     start = datetime.datetime.now()
-    data = yaml.load(f, Loader=YamlLoader)
+
+    # WORKAROUND for https://github.com/yaml/pyyaml/pull/181
+    with log.ignore_py_warnings(
+            category=DeprecationWarning,
+            message=r"Using or importing the ABCs from 'collections' instead "
+            r"of from 'collections\.abc' is deprecated, and in 3\.8 it will "
+            r"stop working"):
+        data = yaml.load(f, Loader=YamlLoader)
+
     end = datetime.datetime.now()
 
     delta = (end - start).total_seconds()