move certificate classes to their own namespace

lib/private/certificate/certificate.php

@@ -6,7 +6,7 @@
  * See the COPYING-README file.
  */
 
-namespace OC;
+namespace OC\Certificate;
 
 use OCP\ICertificate;
 
@@ -75,7 +75,7 @@ class Certificate implements ICertificate {
 	 * @return string
 	 */
 	public function getSerial() {
-		return $this->getSerial();
+		return $this->serial;
 	}
 
 	/**

lib/private/certificate/certificatemanager.php

@@ -6,7 +6,7 @@
  * See the COPYING-README file.
  */
 
-namespace OC;
+namespace OC\Certificate;
 
 use OCP\ICertificateManager;
 

lib/private/server.php

@@ -6,6 +6,7 @@ use OC\AppFramework\Http\Request;
 use OC\AppFramework\Db\Db;
 use OC\AppFramework\Utility\SimpleContainer;
 use OC\Cache\UserCache;
+use OC\Certificate\CertificateManager;
 use OC\DB\ConnectionWrapper;
 use OC\Files\Node\Root;
 use OC\Files\View;