Implement React Context API

- Move API GET request to /v2/config out to the top level of our App.
- Store /v2/config response data in sessionStorage.
- Use Context API to pass down relevant data to Organizations component.
- Wrap our AnsibleSelect component as a context consumer and pass in the list of Ansible Environments of the logged in user.
- Clear sessionStorage object when user logs out.
- Update unit tests.

__tests__/components/AnsibleSelect.test.jsx

@@ -2,16 +2,29 @@ import React from 'react';
 import { mount } from 'enzyme';
 import AnsibleSelect from '../../src/components/AnsibleSelect';
 
-const mockData = ['foo', 'bar'];
+const label = "test select"
+const mockData = ["/venv/baz/", "/venv/ansible/"];
 describe('<AnsibleSelect />', () => {
-  test('initially renders succesfully', async() => {
-    const wrapper = mount(<AnsibleSelect selected="foo" data={mockData} selectChange={() => {}} />);
-    wrapper.setState({ isHidden: false });
+  test('initially renders succesfully', async () => {
+    mount(
+      <AnsibleSelect
+        selected="foo"
+        selectChange={() => { }}
+        labelName={label}
+        data={mockData}
+      />
+    );
   });
   test('calls "onSelectChange" on dropdown select change', () => {
     const spy = jest.spyOn(AnsibleSelect.prototype, 'onSelectChange');
-    const wrapper = mount(<AnsibleSelect selected="foo" data={mockData} selectChange={() => {}} />);
-    wrapper.setState({ isHidden: false });
+    const wrapper = mount(
+      <AnsibleSelect
+        selected="foo"
+        selectChange={() => { }}
+        labelName={label}
+        data={mockData}
+      />
+    );
     expect(spy).not.toHaveBeenCalled();
     wrapper.find('select').simulate('change');
     expect(spy).toHaveBeenCalled();