Fix prompt usage in admin-guide-cloud

Use # for root and $ for-non root commands.
Also fixes some screen markup.

Change-Id: I026bd3b4b1fffa1829210fe53112dfd0f122a60c
Add note about NFS config options for use with NetApp drivers

This change attempts to make it apparent that configuration
options for cinders generic NFS driver also affect the NetApp NFS
drivers.

Change-Id: Ia99ea8fb4cfc778afafd161b7e6eede7a98de255
backport: none
Merge "Fix prompt usage in admin-guide-cloud"
Merge "Add note about NFS config options for use with NetApp drivers"