Updated armband

Updated armband
Project: fuel  242641444b6f64ef7e1ca6399a77d080f74987d7

KVM scenario updates

1. Install CEPH_OSD on 2 compute nodes
2. Delete default 'net_segment_type: tun' definition, for it
   is already defined in dea_base.yaml, and it can be updated
   by lab dea files
3. Update osd_pool_size from 1 to 2
4. Michal indicates that
https://review.openstack.org/#/c/342717/ set the limitation
: Restrict usage of controller and osd role on single host

Change-Id: I4907482391588fc21ecf60603b1c599413cbc531
Signed-off-by: Julien-zte <zhang.jun3g@zte.com.cn>