test(python): give filesystem paths to pytest-cov

https://pytest-cov.readthedocs.io/en/latest/config.html

The pytest-cov docs seem to suggest a filesystem path is expected.

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Wed Dec 2 09:28:04 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: f94318521f63085b9ccb43d42af89f153fb39f15
Source-Link: googleapis/synthtool@f943185

noxfile.py

@@ -79,9 +79,8 @@ def default(session):
     session.run(
         "py.test",
         "--quiet",
-        "--cov=google.cloud.runtimeconfig",
-        "--cov=google.cloud",
-        "--cov=tests.unit",
+        "--cov=google/cloud",
+        "--cov=tests/unit",
         "--cov-append",
         "--cov-config=.coveragerc",
         "--cov-report=",

synth.metadata

@@ -11,7 +11,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "69629b64b83c6421d616be2b8e11795738ec8a6c"
+        "sha": "f94318521f63085b9ccb43d42af89f153fb39f15"
       }
     }
   ],