ipa[server,replica]: Fix pkcs12 info regressions introduced with CA-less

With the CA-less patches the types for the pkcs12 infos have been changed
to lists in the modules. This is resulting in a bad conversion from None
to [''] for the parameters. Because of this a normal replica deployment is
failing as [''] is not a valid value.

The install.yml files for ipareplica and also ipaserver have been changed
in the way that the pkcs12 values are checked if they are None. The
parameter will simply be omitted in this case and the parameter in the
module will become None by default.