Update eslint and eslint-config-openstack to latest versions

The newest eslint-config-openstack provides all the
ES2015-related extra rules we had in the local .eslintrc,
so that they can be removed.

Also, cloudsYamlPath.js was modified to adapt to
`keyword-spacing` rule modifications in eslint v3.

Change-Id: I55198a323a0ada7a74f425d21db42306d9548cb7

.eslintrc

@@ -1,26 +1 @@
-extends: openstack
-
-parserOptions:
-  ecmaVersion: 6
-  sourceType: module
-
-rules:
-  # disallow unnecessary .call() and .apply()
-  # http://eslint.org/docs/rules/no-useless-call
-  no-useless-call: 2
-
-  # require let or const instead of var
-  # http://eslint.org/docs/rules/no-var
-  no-var: 2
-
-  # suggest using arrow functions as callbacks
-  # http://eslint.org/docs/rules/prefer-arrow-callback
-  prefer-arrow-callback: 2
-
-  # suggest using the spread operator instead of .apply().
-  # http://eslint.org/docs/rules/prefer-spread
-  prefer-spread: 2
-
-  # suggest using the rest parameters instead of arguments
-  # http://eslint.org/docs/rules/prefer-rest-params
-  prefer-rest-params: 2
+extends: openstack/es2015

package.json

@@ -39,8 +39,8 @@
     "babel-plugin-transform-inline-environment-variables": "^6.8.0",
     "babel-preset-es2015": "^6.9.0",
     "babel-register": "^6.9.0",
-    "eslint": "^2.4.0",
-    "eslint-config-openstack": "2.0.0",
+    "eslint": "^3.0.0",
+    "eslint-config-openstack": "4.0.1",
     "fetch-mock": "^5.0.5",
     "istanbul": "^1.0.0-alpha.2",
     "jasmine": "^2.4.1",

test/functional/helpers/cloudsYamlPath.js

@@ -12,7 +12,7 @@ function fileExists(path) {
   try {
     fs.statSync(path);
     return true;
-  } catch(err) {
+  } catch (err) {
     return false;
   }
 }