ENH: elaborated debug log message about already detected failures

Now it should be evaluated only if logging mode is debug or "lower", and also
should happen not only on initial detections but for every added failure.
It also reports counts per each IP now

server/failmanager.py

@@ -105,8 +105,15 @@ class FailManager:
 				fData.setLastReset(unixTime)
 				fData.setLastTime(unixTime)
 				self.__failList[ip] = fData
-			logSys.debug("Currently have failures from %d IPs: %s"
-						 % (len(self.__failList), self.__failList.keys()))
+
+			if logSys.getEffectiveLevel() <= logging.DEBUG:
+				# yoh: Since composing this list might be somewhat time consuming
+				# in case of having many active failures, it should be ran only
+				# if debug level is "low" enough
+				failures_summary = ', '.join(['%s:%d' % (k, v.getRetry())
+											  for k,v in  self.__failList.iteritems()])
+				logSys.debug("Currently have failures from %d IPs (IP:count): %s"
+							 % (len(self.__failList), failures_summary))
 			self.__failTotal += 1
 		finally:
 			self.__lock.release()