nickel: add self ('olivneh') w/sudo

I expect to be doing a lot of work w/Ganglia over the next several months and
It'd be useful to be able to force Puppet runs and to view the Puppet logs to
debug any failures. I have such access on the graphite host (professor) and
it's been extremely useful for developing an understanding how things are set up.

Change-Id: I7093010daf5d276f49f9e80c6ac0708c4df77eca