Update pylintrc to catch more style violations.

The current PyLint configuration doesn't catch violations
to the Chromium Python Style Guide in a good way.

This change adds mostly the correct style regex for functions
and methods, with most content copied from
https://cs.chromium.org/chromium/tools/depot_tools/pylintrc
and (since the former disables invalid-name)
https://cs.chromium.org/chromium/src/third_party/chromite/pylintrc

Many settings are the defaults, but are now more explicit to make it
easier to find them for our users.

Also convert the previous one-line list of disabled lint check into
a one-per-line list instead.

Add import-error to the list of disabled lint checks.

This CL depends on https://codereview.webrtc.org/2812273002/
to be landed first in order to not produce a lot of errors.

BUG=webrtc:7303
NOTRY=True
TESTED=git cl presubmit passing when tested in
combination with https://codereview.webrtc.org/2812273002/
TBR=niklas.enbom@webrtc.org

Review-Url: https://codereview.webrtc.org/2737963003
Cr-Commit-Position: refs/heads/master@{#17685}

PRESUBMIT.py

@@ -526,6 +526,7 @@ def _CommonChecks(input_api, output_api):
       black_list=(r'^base[\\\/].*\.py$',
                   r'^build[\\\/].*\.py$',
                   r'^buildtools[\\\/].*\.py$',
+                  r'^infra[\\\/].*\.py$',
                   r'^ios[\\\/].*\.py$',
                   r'^out.*[\\\/].*\.py$',
                   r'^testing[\\\/].*\.py$',
@@ -535,10 +536,6 @@ def _CommonChecks(input_api, output_api):
                   r'^tools-webrtc[\\\/]mb[\\\/].*\.py$',
                   r'^tools-webrtc[\\\/]valgrind[\\\/].*\.py$',
                   r'^xcodebuild.*[\\\/].*\.py$',),
-      disabled_warnings=['F0401',  # Failed to import x
-                         'E0611',  # No package y in x
-                         'W0232',  # Class has no __init__ method
-                        ],
       pylintrc='pylintrc'))
 
   # TODO(nisse): talk/ is no more, so make below checks simpler?