Add new options to CreateSliver/Provision; supply an x509 certificate and
private key. The goal is to distribute an experiment wide certificate and private key. At the moment this is just a self signed x509 certificate and the accompanying rsa key. In PEM format. The same cert/key will be distributed across multiple aggregates. An openssh key pair can be trivially derived from the private key. Or the public part can be derived from the certificate. A quick google will show show. Initially, you will need to run tmcc directly to get them, using the geni_certificate and geni_key commands.
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