Add a DebugFilter class to weboob/tools/log.py

The browser2 filter debugging is an extra level of "Debug". Since python
logging does not support adding severity levels, we use the Filter class
to remove the lines by default.

Sadly, we cannot pass variable to filters (logging system does not use
the instance passed with addFilter method), so we use to write a filter
for each use case (today: only one...)

weboob/tools/log.py

@@ -18,7 +18,7 @@
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
 from collections import defaultdict
-from logging import Formatter, getLogger as _getLogger
+from logging import Filter, Formatter, getLogger as _getLogger
 import sys
 
 
@@ -49,6 +49,16 @@ def getLogger(name, parent=None):
     return logger
 
 
+class DebugFilter(Filter):
+    """
+    Allow a fine filtering of debug output
+    """
+    def filter(self, record):
+        if record.name == "b2filters":
+            return False
+        return True
+
+
 class ColoredFormatter(Formatter):
     """
     Class written by airmind: