bug #2859: fix VNC in Xen PV deployment file
Added `status` to Sunstone init scripts for Ubuntu
Added `status` to Sunstone init scripts for Debian
Added `status` to init script usage msgs
bug #2868: fix OpenNebula.pool_page size problem

Now OpenNebula.pool_page_size is a module method and the value is stored
in the class variable @@pool_page_size