Moved startGhost function to local utils

refs https://github.com/TryGhost/Toolbox/issues/135

- Having the proxy in local utils allows to disable frontend gradually in test suites instead of all at once (the latter approach didn't work out as too many other suites still depend on full frontend initialization)

test/e2e-api/admin/utils.js

@@ -207,5 +207,14 @@ module.exports = {
             Buffer.from(testUtils.DataGenerator.Content.api_keys[0].secret, 'hex'),
             JWT_OPTIONS
         );
+    },
+
+    async startGhost(overrides = {}) {
+        const defaults = {
+            withBackend: true,
+            withFrontend: false
+        };
+
+        return await testUtils.startGhost(Object.assign(defaults, overrides));
     }
 };

test/e2e-api/content/utils.js

@@ -96,5 +96,13 @@ module.exports = {
     },
     getValidKey() {
         return testUtils.DataGenerator.Content.api_keys[1].secret;
+    },
+    async startGhost(overrides = {}) {
+        const defaults = {
+            withBackend: true,
+            withFrontend: false
+        };
+
+        return await testUtils.startGhost(Object.assign(defaults, overrides));
     }
 };