Clean Raw Data: SNMP

[rufuspollock]

This should run AWS.

• [x] Fetch and uncompress
• [x] Sample (?) - maybe at rate 1
• [x] Clean - filter
• [x] Parse - put into standard internal format

[chorsley]

First full run available at dev/clean/snmp-data/, please test importing / aggregating. If there are no problems, can close this issue.