Fix event_catcher blacklisted events logging

The event catcher runner was printing the blacklisted events array using
the VMDBLogger#log_hashes method.  Now that this method calls .to_hash
on the argument
(ManageIQ/manageiq-gems-pending#268)
this is throwing an exception for non-hash type arguments.

Instead of using log_hashes just log the elements of the array joined by
newlines directly.

app/models/manageiq/providers/base_manager/event_catcher/runner.rb

@@ -18,8 +18,7 @@ def after_initialize
     do_exit("EMS ID [#{@cfg[:ems_id]}] failed authentication check.", 1) unless @ems.authentication_check.first
 
     @filtered_events = @ems.blacklisted_event_names
-    _log.info("#{log_prefix} Event Catcher skipping the following events:")
-    $log.log_hashes(@filtered_events)
+    _log.info("#{log_prefix} Event Catcher skipping the following events:\n#{@filtered_events.to_a.join("\n")}")
 
     configure_event_flooding_prevention if worker_settings.try(:[], :flooding_monitor_enabled)