Require CAPTCHA for password recovery

https://jira.coreos.com/browse/QS-79

static/directives/recovery-form.html

@@ -18,6 +18,14 @@
 
     <form class="form-signin" ng-submit="sendRecovery()" ng-show="!sent">
       <input type="text" class="form-control" placeholder="Email" ng-model="recovery.email">
+
+      <div quay-require="['RECAPTCHA']">
+        <div class="captcha"
+             ng-class="{'expanded': recovery.email}">
+          <div vc-recaptcha ng-model="recovery.recaptcha_response" key="Config.RECAPTCHA_SITE_KEY"></div>
+        </div>
+      </div>
+    
       <button class="btn btn-primary btn-block" type="submit">Send Recovery Email</button>
     </form>
   </div>