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

This reverts commit 03ff08ed4ccd65344fa7a9fa2706377335245f69.

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

Change-Id: Iac0a1fe32452735ff722c7b6495c2495a2954882
1 file changed