HUM-304 Install sysstat for disk_utilisation.py
HUM-304 Install sysstat for disk_utilisation.py

disk_utilisation.py requires sysstat for iostat to be present. In RPC-O
the openstack-hosts role will install sysstat so for RPC-O it was always
present.

When using a standlone ceph deployment or other service that doesn't
require the openstack-hosts role, we need sysstat in order to run the
disk_utilisation.py monitoring script.

npawelek/rpc-maas,cloudnull/rpc-maas,cfarquhar/rpc-maas,cloudnull/rpc-maas,npawelek/rpc-maas,cfarquhar/rpc-maas,cloudnull/rpc-maas,briancurtin/rpc-maas,npawelek/rpc-maas,briancurtin/rpc-maas,cfarquhar/rpc-maas,briancurtin/rpc-maas