Run pyformat on cbuildbot.py and add parens around help output.
Run pyformat on cbuildbot.py and add parens around help output.

This fixes 317 complaints from gpylint about indentation errors.

BUG=none
TEST=Unit tests.
Change-Id: I19dcc0d0cd4a7039146501abf7e27c04afd070f2
Reviewed-on: https://chromium-review.googlesource.com/203494
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Reviewed-by: Don Garrett <546ec366615570e68497e3c5df9092106a9808f4@chromium.org>
Commit-Queue: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite