Revert "Revert "Ensure necessary external storage dirs while creating sandboxes.""

This reverts commit 88114b2a563d5bbbc68a16566e223797f4136227.

Reason for revert: blocking issue in b/124345887 is resolved

Change-Id: Ie34843c12b7a471d2384b64ad049ede63aed09e8
4 files changed