#2185941 Converted user_page() to a new style controller

from:
  fqn: 'fn:user_login_form'
to:
  fqn: \Drupal\user\Form\UserLoginForm
from:
  fqn: 'fn:user_page'
to:
  fqn: '\Drupal\user\Controller\UserController::userPage'
from:
  fqn: 'fn:user_login_name_validate'
to:
  fqn: '\Drupal\user\Form\UserLoginForm::validateName'
from:
  fqn: 'fn:user_login_authenticate_validate'
to:
  fqn: '\Drupal\user\Form\UserLoginForm::validateAuthentication'
from:
  fqn: 'fn:user_login_final_validate'
to:
  fqn: '\Drupal\user\Form\UserLoginForm::validateFinal'
from:
  fqn: 'fn:user_login_finalize'
to:
  fqn: 'fn:user_login_finalize'