Correct getpeerinfo JSON marshalling for omitempty.

The fields of the PeerInfo should not have been marked omit as the only
ones that should be omitted to for compatibility are the SyncNode and
BanScore fields.

server.go

@@ -260,17 +260,17 @@ func (s *server) handleBroadcastMsg(state *peerState, bmsg *broadcastMsg) {
 
 // PeerInfo represents the information requested by the getpeerinfo rpc command.
 type PeerInfo struct {
-	Addr           string `json:"addr,omitempty"`
-	Services       string `json:"services,omitempty"`
-	LastSend       int64  `json:"lastsend,omitempty"`
-	LastRecv       int64  `json:"lastrecv,omitempty"`
-	BytesSent      int    `json:"bytessent,omitempty"`
-	BytesRecv      int    `json:"bytesrecv,omitempty"`
-	ConnTime       int64  `json:"conntime,omitempty"`
-	Version        uint32 `json:"version,omitempty"`
-	SubVer         string `json:"subver,omitempty"`
-	Inbound        bool   `json:"inbound,omitempty"`
-	StartingHeight int32  `json:"startingheight,omitempty"`
+	Addr           string `json:"addr"`
+	Services       string `json:"services"`
+	LastSend       int64  `json:"lastsend"`
+	LastRecv       int64  `json:"lastrecv"`
+	BytesSent      int    `json:"bytessent"`
+	BytesRecv      int    `json:"bytesrecv"`
+	ConnTime       int64  `json:"conntime"`
+	Version        uint32 `json:"version"`
+	SubVer         string `json:"subver"`
+	Inbound        bool   `json:"inbound"`
+	StartingHeight int32  `json:"startingheight"`
 	BanScore       int    `json:"banscore,omitempty"`
 	SyncNode       bool   `json:"syncnode,omitempty"`
 }