*able checks within jobs should not be necessary with skiplist

lib/App/Netdisco/Backend/Worker/Poller/Common.pm

@@ -58,6 +58,7 @@ sub _single_body {
   my $filter_method = $job_type .'_filter';
   my $job_filter = $self->$filter_method;
 
+  # failsafe, should not be needed with skip checks
   unless ($job_filter->($device->ip)) {
       return job_defer("$job_type deferred: $host is not ${job_type}able");
   }

lib/App/Netdisco/Backend/Worker/Poller/Device.pm

@@ -54,6 +54,7 @@ sub discover {
       return job_done("discover skipped: $host is pseudo-device");
   }
 
+  # failsafe, should not be needed with skip checks
   unless (is_discoverable_now($device->ip)) {
       return job_defer("discover deferred: $host is not discoverable");
   }

lib/App/Netdisco/Backend/Worker/Poller/Nbtstat.pm

@@ -29,6 +29,7 @@ sub nbtstat  {
     or job_error("nbtstat failed: unable to interpret device parameter");
   my $host = $device->ip;
 
+  # failsafe, should not be needed with skip checks
   unless (is_macsuckable($device->ip)) {
       return job_defer("nbtstat deferred: $host is not macsuckable");
   }