slapgrid: compare os name in lower case

When comparing OS to see if they match for binary cache, we only compare
the lower case distribution name because sometimes "Debian' is
capitalized and sometimes not.

slapos/grid/distribution.py

@@ -58,8 +58,7 @@ def _debianize(os_):
     distname_lower = distname.lower()
     if distname_lower == 'debian' and '.' in version:
         version = version.split('.')[0]
-        distname = distname_lower
-    return distname, version, id_
+    return distname_lower, version, id_
 
 
 def os_matches(os1, os2):

slapos/tests/test_distribution.py

@@ -35,17 +35,18 @@ class TestDebianize(unittest.TestCase):
     def test_debian_major(self):
         """
         On debian, we only care about major release.
-        All the other tuples are unchanged.
+        All the other tuples are unchanged (except distribution name which is lower case).
         """
         for provided, expected in [
-            (('CentOS', '6.3', 'Final'), None),
-            (('Ubuntu', '12.04', 'precise'), None),
-            (('Ubuntu', '13.04', 'raring'), None),
-            (('Fedora', '17', 'Beefy Miracle'), None),
+            (('CentOS', '6.3', 'Final'), ('centos', '6.3', 'Final')),
+            (('Ubuntu', '12.04', 'precise'), ('ubuntu', '12.04', 'precise')),
+            (('Ubuntu', '13.04', 'raring'), ('ubuntu', '13.04', 'raring')),
+            (('Fedora', '17', 'Beefy Miracle'), ('fedora', '17', 'Beefy Miracle')),
             (('debian', '6.0.6', ''), ('debian', '6', '')),
             (('debian', '7.0', ''), ('debian', '7', '')),
+            (('Debian', '8.11', ''), ('debian', '8', '')),
         ]:
-            self.assertEqual(distribution._debianize(provided), expected or provided)
+            self.assertEqual(distribution._debianize(provided), expected)
 
 
 class TestOSMatches(unittest.TestCase):
@@ -70,3 +71,5 @@ class TestOSMatches(unittest.TestCase):
                                                 ('debian', '6.0.5', '')))
         self.assertTrue(distribution.os_matches(('debian', '6.0.6', ''),
                                                 ('debian', '6.1', '')))
+        self.assertTrue(distribution.os_matches(('Debian', '8.11', ''),
+                                                ('debian', '8.4', '')))