enable triton credentials from credentials.json

credentials can be set not only using ENV variables,
but also with credentials.json (if it is found)

cloudapi-graphql/src/api/request.js

@@ -1,10 +1,4 @@
-const credentials = {
-  url: process.env.SDC_URL,
-  account: process.env.SDC_ACCOUNT,
-  user: process.env.SDC_USER || '',
-  keyId: process.env.SDC_KEY_ID,
-};
-
+const credentials = require('../credentials');
 const auth = require('smartdc-auth');
 const cloudapi = require('triton/lib/cloudapi2');
 const bunyan = require('bunyan');

cloudapi-graphql/src/credentials.js

@@ -0,0 +1,14 @@
+const json = (() => {
+  try {
+    return require('../credentials.json');
+  } catch (err) {
+    return {};
+  }
+})();
+
+module.exports = {
+  url: process.env.SDC_URL || json.url || '',
+  account: process.env.SDC_ACCOUNT || json.account || '',
+  user: process.env.SDC_USER || json.user || '',
+  keyId: process.env.SDC_KEY_ID || json.keyId || ''
+};