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/JobQueue/PostgreSQL.pm

@@ -315,7 +315,7 @@ sub jq_userlog {
   return schema(vars->{'tenant'})->resultset('Admin')->search({
     username => $user,
     log      => { '-not_like' => 'duplicate of %' },
-    finished => { '>' => \"(LOCALTIMESTAMP - interval '5 seconds')" },
+    finished => { '>' => \"(CURRENT_TIMESTAMP - interval '5 seconds')" },
   })->with_times->all;
 }