Foreman Maintain

Tests for preparation steps

Improve reporting on hammer setup and preparation steps

Hammer setup preparation step

Turn hammer feature into a utils class

After looking more into this, I think the util class is actually better
fit for the hammer case. I've also removed the detection of the
credentials from hammer configuration, as we actually don't need
the credentials by our own.

Fixes #1 - IO operations on disk and file system

1) Removed feature DiskIO(Check is sufficent)
2) rename Concerns::DiskUtility to Utils::Disk
3) Move disk_utlity_concerns logic to Check itself
4) confine hdparm and fio
5) Error log message - verbore and descriptive...