Revert "[cta-admin] mount policy add,ch,ls"

This revert is due to the fact that we will probably not put the
maxdrivesallowed in the mount policy object. We will put it in the
TAPE_POOL table and in the VIRTUAL_ORGANIZATION table

This reverts commit f48c6cc48eaa9ab9e77fff5a4537a7a4641896b6.