Fix Promise.defer warnings in getconfig.js (#7409)

Signed-off-by: Aaron Raimist <aaron@raim.ist>

src/vector/getconfig.js

@@ -33,8 +33,7 @@ export async function getVectorConfig(relativeLocation) {
 }
 
 function getConfig(configJsonFilename) {
-    let deferred = Promise.defer();
-
+    return new Promise(function(resolve, reject) {
         request(
             { method: "GET", url: configJsonFilename },
             (err, response, body) => {
@@ -48,10 +47,10 @@ function getConfig(configJsonFilename) {
                     // from a file:// URI.
                     if (response) {
                         if (response.status == 404 || (response.status == 0 && body == '')) {
-                        deferred.resolve({});
+                            resolve({});
                         }
                     }
-                deferred.reject({err: err, response: response});
+                    reject({err: err, response: response});
                     return;
                 }
 
@@ -59,9 +58,8 @@ function getConfig(configJsonFilename) {
                 // parameter, since this throws a parse error on empty
                 // which breaks if there's no config.json and we're
                 // loading from the filesystem (see above).
-            deferred.resolve(JSON.parse(body));
+                resolve(JSON.parse(body));
             }
         );
-
-    return deferred.promise;
+    })
 }