Import keyconf at file scope again in config.py

Various code (like src2asciidoc.py) relies on all @cmdutils.register
decorators being called when qutebrowser.app is imported.

Moving the keyconf import to _init_key_config broke that assumption, as
keyconf isn't imported anywhere anymore - which caused :bind and :unbind
to vanish from the generated documentation.

In the long run we should perhaps use venusian:
http://docs.pylonsproject.org/projects/venusian/

But for now, this is the easiest solution.

qutebrowser/config/config.py

@@ -36,6 +36,7 @@ import collections.abc
 from PyQt5.QtCore import pyqtSignal, QObject, QUrl, QSettings
 
 from qutebrowser.config import configdata, configexc, textwrapper
+from qutebrowser.config.parsers import keyconf
 from qutebrowser.config.parsers import ini
 from qutebrowser.commands import cmdexc, cmdutils
 from qutebrowser.utils import (message, objreg, utils, standarddir, log,
@@ -178,7 +179,6 @@ def _init_key_config(parent):
     Args:
         parent: The parent to use for the KeyConfigParser.
     """
-    from qutebrowser.config.parsers import keyconf
     args = objreg.get('args')
     try:
         key_config = keyconf.KeyConfigParser(standarddir.config(), 'keys.conf',

qutebrowser/config/parsers/keyconf.py

@@ -25,7 +25,7 @@ import itertools
 
 from PyQt5.QtCore import pyqtSignal, QObject
 
-from qutebrowser.config import configdata, textwrapper, config
+from qutebrowser.config import configdata, textwrapper
 from qutebrowser.commands import cmdutils, cmdexc
 from qutebrowser.utils import log, utils, qtutils, message, usertypes
 
@@ -335,6 +335,7 @@ class KeyConfigParser(QObject):
 
     def _validate_command(self, line):
         """Check if a given command is valid."""
+        from qutebrowser.config import config
         if line == self.UNBOUND_COMMAND:
             return
         commands = line.split(';;')