fix(qemu): fix terminal mess up in qemu based deployment

PR: #459
Signed-off-by: Ishaan Gupta <ishaankone@gmail.com>
Reviewed-by: Charalampos Mainas <cmainas@nubificus.co.uk>
Approved-by: Charalampos Mainas <cmainas@nubificus.co.uk>

Author: ishaanxgupta

pkg/unikontainers/hypervisors/qemu.go

@@ -61,7 +61,7 @@ func (q *Qemu) BuildExecCmd(args types.ExecArgs, ukernel types.Unikernel) ([]str
 	cmdString += " -L /usr/share/qemu"   // Set the path for qemu bios/data
 	cmdString += " -cpu host"            // Choose CPU
 	cmdString += " -enable-kvm"          // Enable KVM to use CPU virt extensions
-	cmdString += " -nographic -vga none" // Disable graphic output
+	cmdString += " -display none -vga none -serial stdio -monitor null" // Disable graphic output
 
 	if args.VCPUs > 0 {
 		cmdString += fmt.Sprintf(" -smp %d", args.VCPUs)

pkg/unikontainers/unikernels/linux.go

@@ -190,7 +190,7 @@ func (l *Linux) MonitorCli() types.MonitorCliArgs {
 	switch l.Monitor {
 	case "qemu":
 		extraCliArgs := types.MonitorCliArgs{
-			OtherArgs: " -no-reboot -serial stdio -nodefaults",
+			OtherArgs: " -no-reboot -nodefaults",
 		}
 		if l.InitrdConf && l.RootFsType != "initrd" {
 			extraCliArgs.ExtraInitrd = urunitConfPath