base: cleanup sudo definitions for check-raid.py

We had three separate definitions for check-raid's sudo, using both
sudo_user & file resources, two of which were complete redundant. Get
rid of all that and just replace with a simple, sane, sudo definition.

Also indent the rest of the nrpe checks in the same class.

Change-Id: I4fa36450a09aa1237d866e6572a7761c9947c02b