Disallow LDAP bind if trap is set; support setting trap from user form

app/ldap/controllers/LDAPController.js

@@ -90,6 +90,11 @@ class LDAPController extends Injectable {
             return next(new LDAP.InvalidCredentialsError())
         }
 
+        // Check if the resource has a trap. If so, deny access.
+        if ( item.trap ) {
+            return next(new LDAP.InvalidCredentialsError('This resource currently has a login trap set. Please visit the web UI to release.'))
+        }
+
         this.output.info(`Successfully bound resource as DN: ${req.dn.format(this.configs.get('ldap:server.format'))}.`)
         res.end()
         return next()