Validation will now only verify primary disk of the node.
Description of the role and validation itself now includes
further instructions and explanation.
Validation failure message now recommends introspection as a next step.
node-disks.py module, associated tests and documentation were deleted
Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I68b83bc9c035a4f3cfc04afb098ceb04de602691
14354b222a