[Commotion-admin] [mlab-observatory] Fixing Python code style formatting on all files with YAPF (#94)

[salarcon215]

Reviewed 20 of 20 files at r1.
Review status: 9 of 20 files reviewed at latest revision, all discussions resolved, all commit checks successful.

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https://github.com/m-lab/mlab-observatory/pull/94#issuecomment-145615113
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