The test support code is mainly written from scratch, so in order to
ensure to keep the code quality high, enable pylint and PEP8 checks
for it.

Due to some specialities of the test code, a dedicate pylintrc-test file
is created which configures pylint for test code.

Those differences include:
 - lowercase functions are allowed if the first word is test, assert or
   main
 - lowercase methods are allowed if the first word(s) is test, assert,
   runTests, setUp or tearDown
 - R0201 (method could be a function) is disabled

Signed-off-by: Thomas Thrainer <thomasth@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>