Docstrings formatted according to pep257

Bug #1020184

Removed H404 from PEP8 ignore list.

Change-Id: Iabc75281c5d92c5b399c24c9b65aca139f204b0a
Move to pbr.

Closes bug 1179007

Change-Id: I3666e373389da6ad9a21a195a42918d4dec50cb5
Merge "Docstrings formatted according to pep257"