add stdin_open, tty support, add tests, fix #344

This adds supports for stdin_open: bool and
tty: bool support for kubernetes and openshift
providers in kompose. This maps to the
template.Spec.Containers[0].Stdin and
template.Spec.Containers[0].TTY in Kubernets
world.

Also, added tests.

Fixes #344

pkg/kobject/kobject.go

@@ -69,6 +69,8 @@ type ServiceConfig struct {
 	ServiceType   string            `compose:"kompose.service.type",bundle:""`
 	Build         string            `compose:"build",bundle:""`
 	ExposeService string            `compose:"kompose.service.expose",bundle:""`
+	Stdin         bool              `compose:"stdin_open",bundle:""`
+	Tty           bool              `compose:"tty",bundle:""`
 }
 
 // EnvVar holds the environment variable struct of a container