Replica information file contains the file `cacert.p12` which is protected by
the Directory Manager password of the initial IPA server installation. The DM
password of the initial installation is also used for the PKI admin user
password.
If the DM password is changed after the IPA server installation, the replication
fails.
To prevent this failure, add the following steps to ipa-replica-prepare:
1. Regenerate the `cacert.p12` file and protect it with the current DM password
2. Update the password of the PKI admin user with the current DM password
https://fedorahosted.org/freeipa/ticket/3594
The CA cert was not loaded, so if it was missing from the PKCS#12 file,
installation would fail.
Pass the cert filename to the server installers and include it in
the NSS DB.
Part of the work for: https://fedorahosted.org/freeipa/ticket/3363