Migrate all Peer communication to common Notification subsystem (#7031)

Deprecate the use of Admin Peers concept and migrate all peer
communication to Notification subsystem. This finally allows
for a common subsystem for all peer notification in case of
distributed server deployments.

cmd/peer-rpc-client.go

@@ -168,6 +168,38 @@ func (rpcClient *PeerRPCClient) CPULoadInfo() (ServerCPULoadInfo, error) {
 	return reply, err
 }
 
+// StartProfiling - starts profiling on the remote server.
+func (rpcClient *PeerRPCClient) StartProfiling(profiler string) error {
+	args := StartProfilingArgs{Profiler: profiler}
+	reply := VoidReply{}
+	return rpcClient.Call(peerServiceName+".StartProfiling", &args, &reply)
+}
+
+// DownloadProfilingData - download already running profiling on the remote server.
+func (rpcClient *PeerRPCClient) DownloadProfilingData() ([]byte, error) {
+	args := AuthArgs{}
+	var reply []byte
+	err := rpcClient.Call(peerServiceName+".DownloadProfilingData", &args, &reply)
+	return reply, err
+}
+
+// SignalService - calls load server info RPC.
+func (rpcClient *PeerRPCClient) SignalService(sig serviceSignal) error {
+	args := SignalServiceArgs{Sig: sig}
+	reply := VoidReply{}
+
+	return rpcClient.Call(peerServiceName+".SignalService", &args, &reply)
+}
+
+// ServerInfo - calls load server info RPC.
+func (rpcClient *PeerRPCClient) ServerInfo() (ServerInfoData, error) {
+	args := AuthArgs{}
+	reply := ServerInfoData{}
+
+	err := rpcClient.Call(peerServiceName+".ServerInfo", &args, &reply)
+	return reply, err
+}
+
 // NewPeerRPCClient - returns new peer RPC client.
 func NewPeerRPCClient(host *xnet.Host) (*PeerRPCClient, error) {
 	scheme := "http"