COOPR-568: changes for distributed mode

A user should be able to specify TRUST_CERT_PATH and TRUST_CERT_PASSWORD rather than forcing the reading of `coopr-security.xml` as that assumes the provisioner and server are on the same host. In production, this is likely to not be the case. Our production Coopr installation has a set of Coopr Servers and a set of Coopr Provisioners. Provisioners can run on their own machines.