Initialize terminal pty with initial size set (#277)

When creating a terminal, queue the initial size of the terminal in the
resize channel to ensure the terminal has correct dimensions upon
opening.

Signed-off-by: Angel Misevski <amisevsk@redhat.com>

exec/kubernetes_exec_manager.go

@@ -236,11 +236,13 @@ func (manager *KubernetesExecManager) doCreate(machineExec *model.MachineExec, c
 	machineExec.Executor = executor
 	machineExec.ID = int(atomic.AddUint64(&prevExecID, 1))
 	machineExec.MsgChan = make(chan []byte)
-	machineExec.SizeChan = make(chan remotecommand.TerminalSize)
+	machineExec.SizeChan = make(chan remotecommand.TerminalSize, 1)
 	machineExec.ExitChan = make(chan bool)
 	machineExec.ErrorChan = make(chan error)
 	machineExec.ConnectionHandler = ws.NewConnHandler()
 
+	machineExec.SizeChan <- remotecommand.TerminalSize{Width: uint16(machineExec.Cols), Height: uint16(machineExec.Rows)}
+
 	execs.execMap[machineExec.ID] = machineExec
 
 	return nil