Added SendCmd and SendReboot to QGA code

src/qga/qga.go

@@ -38,6 +38,17 @@ func (q *QGACon)SendShutdown() error {
 	return err
 }
 
+// Send a reboot command to the guest OS.
+func (q *QGACon)SendReboot() error {
+	return q.SendCmd("reboot")
+}
+
+// Send a command to the guest OS.
+func (q *QGACon)SendCmd(cmd string) error {
+	_, err := q.sock.Write([]byte(`{"execute":"guest-exec", "arguments":{"path":"`+cmd+`"}}`))
+	return err
+}
+
 // TODO: work in progress...
 func (q *QGACon)WriteFile(filePath string) error {
 	filePath = "/home/nexus/pipo.txt"