Add protocols type as one or more means of BMC access

[joelrebel]

BMCs can be accessed over one or more of a given set of protocols,

• HTTPs
• SSH
• IPMI
• Redfish
• others - GRPC (ubmc)

We add protocols as a type, each BMC can then declare/be probed for the access protocols supported,
this extends bmclib to be able to,

• Let the caller pick the preferred protocol (if the hardware type/model is known before hand)
• Let the caller pick the order of protocols attempted
• IPMI is added as a separate protocol, instead of mixing the concept as a Provider