bug 1092 fixing deletion of items referenced by several projects

It is only deletes if it the last project referencing it.
Depends on this change at common:  https://osm.etsi.org/gerrit/9134



Change-Id: Id167c0ae3309212b97f59d47a9f3cee7f53fd263
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>