check-raid: readd support for arcconf (Adaptec)

It turns out that arcconf from wikimedia-raid-utils was used in a few
boxes (professor, db boxes in pmtpa etc.). Fetch it from the hwraid repo
as well and modify check-raid.py to reference /usr/sbin instead of
/usr/bin.

While at it, remove the whole sudo logic from check-raid.py and the
arcconf sudoers entry; check-raid.py runs under sudo already and has
root, there's no reason to sudo as root twice. And while removing that,
remove the icinga sudo as well, nrpe runs just as the nagios user.

Change-Id: I08b8a61c3eb8b38c8442156e89a580036dcb0a62