ENGCOM-2061: #15255 unlock customer after password reset #16255

 - Merge Pull Request #16255 from vgelani/magento2:2.1-develop-PR-port-15534
 - Merged commits:
   1. be0f9bc

Author: magento-engcom-team

app/code/Magento/Customer/Model/AccountManagement.php

@@ -586,6 +586,7 @@ public function resetPassword($email, $resetToken, $newPassword)
         $customerSecure->setRpToken(null);
         $customerSecure->setRpTokenCreatedAt(null);
         $customerSecure->setPasswordHash($this->createPasswordHash($newPassword));
+        $this->getAuthentication()->unlock($customer->getId());
         $this->sessionManager->destroy();
         $this->destroyCustomerSessions($customer->getId());
         $this->customerRepository->save($customer);