Adds Block Storage (cinder) install to install and deploy guide.

Removes some nova-volume info as well.

Removes loopback device instructions.

fix bug 1176071
fix bug 1177561

Change-Id: Ia56161b547ae5b39e2ab5558ff5728f640afac14
Merge "Adds Block Storage (cinder) install to install and deploy guide."
Adds variable so there can be two basic install Disqus threads

per package manager (yum and apt).

Fix bug 1178342

Change-Id: Ia2b1141bb58c095bb4e25a734c7b1a785618efc6