Changes in configuration storage and PZP certificate generation

 Configuration has generic function to store data in files.
 PZP generates 3 sets of certificates PZPCA (at enrollment signed by PZH), PZP connection certificate and PZP web socket certificate.

Jira Issue: WP-39
PZP certificate storage in the browser database using certutil and pk12util

PZP now runs on secure web socket connection and uses mutual authentication. Certificates are stored in chrome and mozilla database currently.

Jira Issue: WP-39
Removed storage in the browser database functionality

Storing in browser database will not scale on different platforms.
The adverse effect of this solution will be browser not mutual authenticated.
It does not stop PZP from using secure websocket.

Jira Issue: WP-39
Removed conn from the conn certificates

Jira Issue: WP-39