build: fix system tests, move to Kokoro (#372)

diff --git a/setup.cfg b/setup.cfg
index 0f15a38..7c2b287 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,17 +1,2 @@
 [bdist_wheel]
-universal = 1
-
-[pytype]
-# Where to start analysis.
-inputs = .
-# Some files aren't worth analyzing, namely tests. Hidden directories (e.g.
-# .tox) are automatically filtered out.
-exclude = tests system_tests
-# All pytype output goes here.
-output = pytype_output
-# Python version (major.minor) of the target code.
-python_version = 3.6
-# Paths to source code directories, separated by ':'.
-pythonpath = .
-# Errors to disable.
-disable = pyi-error
+universal = 1
\ No newline at end of file