adds -s flag in the hopes of enabling debugging in remote repo

Author: chalmerlowe

noxfile.py

@@ -220,6 +220,7 @@ def unit(session, protobuf_implementation):
     session.run(
         "py.test",
         "--quiet",
+        "-s",
         f"--junitxml=unit_{session.python}_sponge_log.xml",
         "--cov=google",
         "--cov=tests/unit",