lint: fix quoting style everywhere

BUG=chromium:990019
TEST=`cros lint` is clean & CQ passes

Change-Id: I012966d34a45a01b3a940414b24316aee4ffe8af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1731476
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Will Bradley <wbbradley@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cros_generate_sysroot_unittest.py b/scripts/cros_generate_sysroot_unittest.py
index 03a982c..c24cf0e 100644
--- a/scripts/cros_generate_sysroot_unittest.py
+++ b/scripts/cros_generate_sysroot_unittest.py
@@ -85,7 +85,7 @@
 
   def testMultiplePkgsTargetName(self):
     """Test getting the right target name with multiple pkgs."""
-    pkgs = "%s virtual/target-os" %constants.CHROME_CP
+    pkgs = '%s virtual/target-os' % constants.CHROME_CP
     options = cros_gen.ParseCommandLine(
         ['--board', BOARD, '--out-dir', self.tempdir,
          '--package', pkgs])