Added support of RAID to smart-stats.py. Closes OpenTSDB/tcollector#232

[sanblch]

#232 #233

1. It selects working drives by common method and then by smartmontools.

glob.glob(\"/dev/[hs]d[a-z]{1,2}\")
smartctl --scan-open

1. It writes normalized smart values also.
2. It gives 2 variants of naming smart variables: by number and by real name.
3. It is able to get smart data from megaraid arrays by means of smartmontools.
4. It checks serial number and deletes duplicated devices according to priority above.

[sanblch]

Hi! Check, please. Everything works fine for me. It is more robust to define disk drives as it uses 'smartctl --scan-open' command. And then check each drive by its type. It need additional fixes of coarse. If you like it, I'll make more changes.

[johann8384]

I'll start testing this, can you confirm you have completed the CLA?

[sanblch]

Thanks for you collaboration, I've completed it.

[johann8384]

Lets leave this "env python"