tests: correct name of check_db to check_repo

- this test is checking the package *repository*, not the database.

lib/spack/spack/test/package_sanity.py

@@ -27,13 +27,12 @@
 
 import pytest
 
+import spack.paths
 import spack.repo
-from spack.paths import mock_packages_path
-from spack.repo import RepoPath
 
 
-def check_db():
-    """Get all packages in a DB to make sure they work."""
+def check_repo():
+    """Get all packages in the builtin repo to make sure they work."""
     for name in spack.repo.all_package_names():
         spack.repo.get(name)
 
@@ -41,14 +40,14 @@ def check_db():
 @pytest.mark.maybeslow
 def test_get_all_packages():
     """Get all packages once and make sure that works."""
-    check_db()
+    check_repo()
 
 
 def test_get_all_mock_packages():
     """Get the mock packages once each too."""
-    db = RepoPath(mock_packages_path)
+    db = spack.repo.RepoPath(spack.paths.mock_packages_path)
     with spack.repo.swap(db):
-        check_db()
+        check_repo()
 
 
 def test_all_versions_are_lowercase():