Add setLogLevel as an export.

mininet/log.py

@@ -170,6 +170,9 @@ def newfn( *args ):
     setattr( newfn, '__doc__', fn.__doc__ )
     return newfn
 
-info, output, warn, error, debug = lg.info, lg.output, lg.warn, lg.error, \
-    lg.debug = [ makeListCompatible( f ) for f in lg.info, lg.output, lg.warn,
-                 lg.error, lg.debug ]
+info, output, warn, error, debug = ( 
+    lg.info, lg.output, lg.warn, lg.error, lg.debug ) = [ 
+        makeListCompatible( f ) for f in 
+            lg.info, lg.output, lg.warn, lg.error, lg.debug ]
+
+setLogLevel = lg.setLogLevel