krb5_get_init_creds_password does not consistently prompt for password changing

krb5_get_init_creds_password does not consistently prompt for password changing

 	krb5_get_init_creds_password() previously did not consistently
	handle KRB5KDC_ERR_KEY_EXP errors.  If there is a "master_kdc"
 	entry for the realm and the KDC is reachable, then the function
	will prompt the user for a password change.  Otherwise, it will
	return the error code to the caller.  If the caller is a ticket
	manager, it will prompt the user for a password change with a
	dialog that is different from the one generated by the prompter
	function passed to krb5_get_init_creds_password.

	With this change krb5_get_init_creds_password() will always
	prompt the user if it would return KRB5KDC_ERR_KEY_EXP unless
	the function is compiled with USE_LOGIN_LIBRARY.  (KFM)

ticket: new
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@18764 dc483132-0cff-0310-8789-dd5450dbe970