Add common XCP RPC code (note this corresponds to the current protocol, not the future one)
Add common XCP RPC code (note this corresponds to the current protocol, not the future one)

xapi-project/message-switch,johnelse/xcp-idl,Chunjie/xcp-idl,djs55/xcp-idl,euanh/xcp-idl,xapi-project/message-switch,xapi-project/message-switch