chore: replace local 'test_utils' w/ PyPI version (#146)

Closes #145

Author: tseaver

noxfile.py

@@ -140,8 +140,6 @@ def system(session):
     # Install all test dependencies, then install this package into the
     # virtualenv's dist-packages.
     session.install("mock", "pytest", "google-cloud-testutils", "-c", constraints_path)
-    session.install("-e", "test_utils", "-c", constraints_path)
-
     session.install("-e", ".", "-c", constraints_path)
 
     # Run py.test against the system tests.

owlbot.py

@@ -32,7 +32,6 @@
 templated_files = common.py_library(
     samples=True,  # set to True only if there are samples
     microgenerator=True,
-    system_test_dependencies=["test_utils"],
     cov_level=98,
 )
 s.move(templated_files, excludes=[".coveragerc"])  # microgenerator has a good .coveragerc file