Preserve already configured options in openldap conf

We should respect already configured options present in
/etc/openldap/ldap.conf when generating our own configuration.

With this patch, we only rewrite URI, BASE and TLS_CACERT options
only if they are not configured. In the case they are, our suggested
configuration is inserted as a comment.

Also adds tab as a delimeter character in /etc/openldap/ldap.conf

https://fedorahosted.org/freeipa/ticket/3582
Add support for OpenSSH 6.2.

Run sss_ssh_authorizedkeyscommand as nobody. Automatically update sshd_config
on openssh-server update.

https://fedorahosted.org/freeipa/ticket/3571
Fix: Certificate status is not visible in Service and Host page

https://fedorahosted.org/freeipa/ticket/3593