Cleanup: Add missing comments and newlines in a few files.

BUG=None
TEST=None

Change-Id: If14572f0331a3860e6d82ce085d20e484edc29af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1753551
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Alex Klein <saklein@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/api/controller/controller_util_unittest.py b/api/controller/controller_util_unittest.py
index 51ea8b7..585760a 100644
--- a/api/controller/controller_util_unittest.py
+++ b/api/controller/controller_util_unittest.py
@@ -92,6 +92,7 @@
   """CPVToPackageInfo tests."""
 
   def testAllFields(self):
+    """Test handling when all fields present."""
     pi = common_pb2.PackageInfo()
     cpv = portage_util.SplitCPV('cat/pkg-2.0.0', strict=False)
 
@@ -101,6 +102,7 @@
     self.assertEqual('2.0.0', pi.version)
 
   def testNoVersion(self):
+    """Test handling when no version given."""
     pi = common_pb2.PackageInfo()
     cpv = portage_util.SplitCPV('cat/pkg', strict=False)
 
@@ -110,6 +112,7 @@
     self.assertEqual('', pi.version)
 
   def testPackageOnly(self):
+    """Test handling when only given the package name."""
     pi = common_pb2.PackageInfo()
     cpv = portage_util.SplitCPV('pkg', strict=False)