Revert "engine: Fix Junit issue Add caching to VdsStatic, VdsDynamic, VdsGroup and VdsSpmIdMap"

This reverts commit aca673b1ad60cc573dbd59017943a5fd27a0597d.

Change-Id: Iea0709c1bc2c952b0d1f8ee8eb111381d9267968
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>