Extending "shared" directory functionality.

Extending "shared" directory functionality.

Tizen 3.x defines new requirement, in which resources located
in "res/wgt/shared" folder should be moved to package ./shared directory.
Additionally, symbolic link should be created ./res/wgt/shared -> ./shared

On the other hand, tizen 2.x applications, should follow old policy (no data
movement)

Solution:
Introduction of derived StepWgtCreateStorageDirectories that adds above
functionality.

Change-Id: I3de99339f7d1123d9501f94577b9e2a79383511d