This new element installs hpssacli utility (for configuring
RAID) and installs proliantutils python module (which has
ironic-python-agent hardware manager for HP ProLiant hardware).
This module also exposes a new environment variable DIB_HPSSACLI_URL
which allows operator to pass a custom HTTP(S) URL for RPM of hpssacli
utility.
NOTE: This module currently supports only installing from source.
Change-Id: I0494e3db623fdd7ea9182ffba21c0652aaad113c
