move discover and discoverall to worker plugins

lib/App/Netdisco/Worker/Plugin/Discover.pm

@@ -0,0 +1,30 @@
+package App::Netdisco::Worker::Plugin::Discover;
+
+use Dancer ':syntax';
+use App::Netdisco::Worker::Plugin;
+use aliased 'App::Netdisco::Worker::Status';
+
+use App::Netdisco::Util::Device 'is_discoverable_now';
+
+register_worker({ primary => true }, sub {
+  my ($job, $workerconf) = @_;
+  my $device = $job->device;
+
+  return Status->error('discover failed: unable to interpret device param')
+    unless defined $device;
+
+  my $host = $device->ip;
+
+  return Status->error("discover failed: no device param (need -d ?)")
+    if $host eq '0.0.0.0';
+
+  return Status->defer("discover skipped: $host is pseudo-device")
+    if $device->vendor and $device->vendor eq 'netdisco';
+
+  return Status->defer("discover deferred: $host is not discoverable")
+    unless is_discoverable_now($device);
+
+  return Status->done('discover is able to run.');
+});
+
+true;