Revert "CP-12141: Remove all master/slave knowledge from xcp-rrdd"
Revert "CP-12141: Remove all master/slave knowledge from xcp-rrdd"

This reverts commit 5a9bfe79294fabdbba3f9b06c5a7193d6b136c86.

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