Client-side search in drop-down boxes

1. Drop-down contents are pre-loaded during page load, search is made local
2. Search support is moved out of API
3. Removed API methods:
   * /releases/<release>
   * /project_types/<project_type>
   * /metrics/<metric>
4. Response of API methods used in drop-downs is unified. All of them
   return content under "data" key, default value under "default"
5. Rename JS functions from c_style to camelCase
6. Adapt DriverLog report to new drop-downs behavior

Part of blueprint ui-performance

Change-Id: I7bd9e9d1176d8419aa1e4bc1ccbb7ab4afdf7583
Merge "Client-side search in drop-down boxes"