validation: squash rootfs propagation tests into a single file

To make the test code simpler, squash tests that are relevant to
rootfs propagation into a single file, linux_rootfs_propagation.go.
Also print TAP output for rootfs_propagation tests.

Signed-off-by: Dongsu Park <[email protected]>

Author: Dongsu Park

validation/linux_rootfs_propagation.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"github.com/mndrix/tap-go"
+	"github.com/opencontainers/runtime-tools/validation/util"
+)
+
+func testLinuxRootPropagation(propMode string) error {
+	g, err := util.GetDefaultGenerator()
+	if err != nil {
+		util.Fatal(err)
+	}
+	g.SetupPrivileged(true)
+	g.SetLinuxRootPropagation(propMode)
+	return util.RuntimeInsideValidate(g, nil)
+}
+
+func main() {
+	t := tap.New()
+	t.Header(0)
+	defer t.AutoPlan()
+
+	cases := []string{
+		"shared",
+		"unbindable",
+	}
+
+	for _, c := range cases {
+		if err := testLinuxRootPropagation(c); err != nil {
+			t.Fail(err.Error())
+		}
+	}
+}