api for actions (#1031)

* implementation of GET and DELETE for Job Queue API

* implement POST jobs submission to queue via API

* implement GET /queue/backends API endpoint to get backend names

lib/App/Netdisco/Web/AuthN.pm

@@ -202,8 +202,8 @@ get '/logout' => sub {
     redirect uri_for(setting('web_home'))->path;
 };
 
-# user redirected here (POST -> GET) when login fails
-get qr{^/(?:login(?:/denied)?)?} => sub {
+# user redirected here when require_role does not succeed
+any qr{^/(?:login(?:/denied)?)?} => sub {
     my $api = ((request->accept and request->accept =~ m/(?:json|javascript)/) ? true : false);
 
     if ($api) {