Move openAsStreamOptimizedVmdk() into importable package

so it can be used later within tests

internal/upload/vmware/vmware.go

@@ -0,0 +1,26 @@
+package vmware
+
+import (
+	"os"
+	"os/exec"
+)
+
+func OpenAsStreamOptimizedVmdk(imagePath string) (*os.File, error) {
+	newPath := imagePath + ".stream"
+	cmd := exec.Command(
+		"/usr/bin/qemu-img", "convert", "-O", "vmdk", "-o", "subformat=streamOptimized",
+		imagePath, newPath)
+	err := cmd.Run()
+	if err != nil {
+		return nil, err
+	}
+	f, err := os.Open(newPath)
+	if err != nil {
+		return nil, err
+	}
+	err = os.Remove(newPath)
+	if err != nil {
+		return nil, err
+	}
+	return f, err
+}