relayprioritizer: low logging levels.

The time it took to run prioritize function is not relevant for
the operator.
After several days, prioritiy would be adjusted for many relays,
so don't log it.
We can have different debug verbose levels in the future.

sbws/lib/relayprioritizer.py

@@ -69,10 +69,11 @@ class RelayPrioritizer:
                     # will come back to them sooner to try again.
                     assert result.freshness_reduction_factor >= 0.0
                     assert result.freshness_reduction_factor <= 1.0
-                    log.debug('Cutting freshness for a %s result by %d%% for '
-                              '%s', result.type.value,
-                              result.freshness_reduction_factor * 100,
-                              relay.nickname)
+                    # After several days, these would log many relays.
+                    # log.debug('Cutting freshness for a %s result by %d%% for'
+                    #           ' %s', result.type.value,
+                    #           result.freshness_reduction_factor * 100,
+                    #           relay.nickname)
                     freshness *= max(1.0-result.freshness_reduction_factor, 0)
                 priority += freshness
             relay.priority = priority
@@ -83,7 +84,7 @@ class RelayPrioritizer:
                      self.min_to_return)
         fn_tstop = Decimal(time.time())
         fn_tdelta = (fn_tstop - fn_tstart) * 1000
-        log.info('Spent %f msecs calculating relay best priority', fn_tdelta)
+        log.debug('Spent %f msecs calculating relay best priority', fn_tdelta)
         # Finally, slowly return the relays to the caller (after removing the
         # priority member we polluted the variable with ...)
         for relay in relays[0:cutoff]: