Please fix longstanding problem with authconfig/pam_ldap config

[Charles Lopes]

I'd like to attract attention to a problem described in bugs #55193, 
#63631, #77575, #86606, #103461 and #118239.
If a system is configured to use LDAP for authentification with 
authconfig, logins to local accounts (root for example) will always fail 
if the LDAP server is unreachable. A possible fix described in bug 
118239 has a working pam config for such cases.
Is there any security concern or backward compatibility issue with the 
proposed configuration?
Is there something that prevent authconfig from being changed to 
generate such a configuration?
This could possibly affect other network authentification mechanism 
(kerberos, smb), althought I can't verify it. Also that could possibly 
fix bug #6371 as well.