replaceUserKeys() actually deletes the users keys -> update method name and doc-block

apps/encryption/hooks/userhooks.php

@@ -296,7 +296,7 @@ class UserHooks implements IHook {
 	public function postPasswordReset($params) {
 		$password = $params['password'];
 
-		$this->keyManager->replaceUserKeys($params['uid']);
+		$this->keyManager->deleteUserKeys($params['uid']);
 		$this->userSetup->setupUser($params['uid'], $password);
 	}
 

apps/encryption/lib/keymanager.php

@@ -557,9 +557,11 @@ class KeyManager {
 	}
 
 	/**
+	 * creat a backup of the users private and public key and then  delete it
+	 *
 	 * @param string $uid
 	 */
-	public function replaceUserKeys($uid) {
+	public function deleteUserKeys($uid) {
 		$this->backupAllKeys('password_reset');
 		$this->deletePublicKey($uid);
 		$this->deletePrivateKey($uid);

apps/encryption/tests/hooks/UserHooksTest.php

@@ -251,7 +251,7 @@ class UserHooksTest extends TestCase {
 
 	public function testPostPasswordReset() {
 		$this->keyManagerMock->expects($this->once())
-			->method('replaceUserKeys')
+			->method('deleteUserKeys')
 			->with('testUser');
 
 		$this->userSetupMock->expects($this->once())