Move run_pylint to gcp-devrel-py-tools (#153)

diff --git a/tox.ini b/tox.ini
index 0a0d806..ddc6430 100644
--- a/tox.ini
+++ b/tox.ini
@@ -77,7 +77,8 @@
     --import-order-style=google \
     --application-import-names="google,tests,system_tests" \
     google tests
-  python {toxinidir}/scripts/run_pylint.py \
+  gcp-devrel-py-tools run-pylint \
+    --config pylint.config.py \
     --library-filesets google \
     --test-filesets tests system_tests
 deps =
@@ -85,3 +86,4 @@
   flake8-import-order
   pylint
   docutils
+  gcp-devrel-py-tools