Allow configuration of a mix of ssl- and non-ssl- enabled entities in the SDP configuration.
Currently, mkdirs.sh and p4_vars have a built-in variable for SSL prefix, working as an all-or-nothing option. Would like the means to pick and choose the components that are to be ssl-enabled and those not: for example, install and configure a Broker that supports SSL connections, while retaining a non-ssl Helix Core Server, standardising on 'One sided SSL certificates'.