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

This reverts commit d5efa763c02a3418fe39ab5b4730f182eebbb039.

Conflicts:
	frontend/webadmin/modules/gwt-common/src/main/resources/org/ovirt/engine/core/Common.gwt.xml

Change-Id: I7029b7386053c5f6c5a229c0706d3eab3a1929ee
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>