adds discovery facts based on ethtool
add IPMI facts
Set SUID bit on ethtool and ipmitool

Foreman-proxy runs under non-root user but it requires to run ethtool
and ipmitool to get more facts. Otherwise facts are silently missing in
uploaded set.
Values must be strings

Otherwise they are silently ignored
Merge pull request #6 from ares/eth-facts

Adds discovery facts based on ethtool and IPMI tools