podman machine ssh: do not print warning everytime

Currenlty this ssh warning is printed everytime:
`Warning: Permanently added '[localhost]:33915' (ED25519) to the list of known hosts.`

Since this is very anoying and makes it harder to capture the actual
command output we should silence this. With log level error we will only
see the important messages from ssh.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

pkg/machine/qemu/machine.go

@@ -952,7 +952,8 @@ func (v *MachineVM) SSH(_ string, opts machine.SSHOptions) error {
 	sshDestination := username + "@localhost"
 	port := strconv.Itoa(v.Port)
 
-	args := []string{"-i", v.IdentityPath, "-p", port, sshDestination, "-o", "UserKnownHostsFile=/dev/null", "-o", "StrictHostKeyChecking=no"}
+	args := []string{"-i", v.IdentityPath, "-p", port, sshDestination, "-o", "UserKnownHostsFile=/dev/null",
+		"-o", "StrictHostKeyChecking=no", "-o", "LogLevel=ERROR"}
 	if len(opts.Args) > 0 {
 		args = append(args, opts.Args...)
 	} else {