Add ipa-advise plugins for nss-pam-ldapd legacy clients
Add three new ipa-advise plugins, to facilitate configuration of
legacy clients using nss-pam-ldapd:
* config-redhat-nss-pam-ldapd
* config-generic-linux-nss-pam-ldapd
* config-freebsd-nss-pam-ldapd
https://fedorahosted.org/freeipa/ticket/3672