IsNotFound should check ErrDefault404 and ErrUnexpectedResponseCode
IsNotFound should check ErrDefault404 and ErrUnexpectedResponseCode

Related to: #60658 #60976
Refer to:
  https://github.com/gophercloud/gophercloud/pull/103

kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes