Add instructions to load nbd kernel module on SUSE based systems
Add instructions to load nbd kernel module on SUSE based systems

This solves the following issue when trying to start a new instance.

---snip---
2014-10-14 13:19:32.791 20021 ERROR nova.virt.disk.mount.nbd [req-38f661b6-
b192-423b-9f41-2c28b9372af1 None] nbd module not loaded
---snap---

Change-Id: I1bc5ab6d0b40d70cb19ada660d1b0b02b7903ba3

AlekhyaMallina-Vedams/openstack-manuals,potsmaster/openstack-manuals,Akasurde/openstack-manuals,openstack/openstack-manuals,potsmaster/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,saeki-masaki/openstack-manuals,openstack/openstack-manuals,gongysh2004/openstack-manual,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,gongysh2004/openstack-manual,kairoaraujo/openstack-manuals,saeki-masaki/openstack-manuals