Fix ordering in cc.pp

We need to have the proper credentials in place before attempting
to register NC, otherwise this will happen:

The following expected credentials are missing:
    /var/lib/eucalyptus/keys/node-cert.pem
    /var/lib/eucalyptus/keys/cluster-cert.pem
    /var/lib/eucalyptus/keys/cloud-cert.pem
    /var/lib/eucalyptus/keys/node-pk.pem
    /var/lib/eucalyptus/keys/cluster-pk.pem