Fix/suppress most pylint and gpylint warnings

* Add missing function doc strings.
  Suppress this warning on trivial functions in *_warn_patterns.py.
* Remove unused g-importing-memeber, g-complex-comprehension.
* Suppress pylint warning on unrecognized g-* options.
* Suppress too-few-public-methods warnings on simple classes.
* Suppress too-many-arguments and missing-function-docstring in
  html_writer.py, which will be refactored later.
* Fix bad naming, long lines and line breaks, and bad quotes.

Test: compare output for build.log
Change-Id: Icdb34f014a10ec1e642c2cfe8003fc3ae245b507