CLOUDSTACK-7824: using debian 7.7.0 and
added 'sharutils' package installation in system template

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-7660: Enhance system vm template to support baremetal
 Installed flask package and removed the disk expert recipe in
system vm template to keep only one partition

Signed-off-by:  Frank Zhang <frank.zhang@citrix.com>