Fix unmount when host volume is removed

Fixes #5244
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

integration-cli/docker_cli_rm_test.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"os"
+	"os/exec"
+	"testing"
+)
+
+func TestRemoveContainerWithRemovedVolume(t *testing.T) {
+	cmd := exec.Command(dockerBinary, "run", "--name", "losemyvolumes", "-v", "/tmp/testing:/test", "busybox", "true")
+	if _, err := runCommand(cmd); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := os.Remove("/tmp/testing"); err != nil {
+		t.Fatal(err)
+	}
+
+	cmd = exec.Command(dockerBinary, "rm", "-v", "losemyvolumes")
+	if _, err := runCommand(cmd); err != nil {
+		t.Fatal(err)
+	}
+
+	deleteAllContainers()
+
+	logDone("rm - removed volume")
+}