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.

src/components/AnsibleSelect/AnsibleSelect.jsx

@@ -1,4 +1,5 @@
 import React from 'react';
+
 import {
   FormGroup,
   Select,
@@ -16,19 +17,19 @@ class AnsibleSelect extends React.Component {
   }
 
   render() {
-    const { hidden } = this.props;
-    if (hidden) {
-      return null;
-    } else {
+    if (this.props.data.length > 1) {
       return (
         <FormGroup label={this.props.labelName} fieldId="ansible-select">
           <Select value={this.props.selected} onChange={this.onSelectChange} aria-label="Select Input">
-            {this.props.data.map((env, index) => (
-              <SelectOption isDisabled={env.disabled} key={index} value={env} label={env} />
+            {this.props.data.map((datum, index) => (
+              <SelectOption isDisabled={datum.disabled} key={index} value={datum} label={datum} />
             ))}
           </Select>
         </FormGroup>
-      );
+      )
+    }
+    else {
+      return null;
     }
   }
 }