move several write_* functions to apparmor.profile_storage

ProfileStorage() stores the content of a profile, so it makes sense to
also have the functions to write those rules (including helper functions
used by these functions) in the same file.

Note that I only moved the functions for rule types that are not handled
by *Ruleset classes.

The functions for writing rules stored in a *Ruleset class will
hopefully be superfluous sooner or later (probably later because
serialize_parse_profile_start() depends on them, and rewriting it won't
be easy)

Also move the test for var_transform() to test-profile-storage.py.

utils/test/test-profile-storage.py

@@ -13,7 +13,7 @@ import unittest
 from common_test import AATest, setup_all_loops
 
 from apparmor.common import AppArmorBug
-from apparmor.profile_storage import ProfileStorage
+from apparmor.profile_storage import ProfileStorage, var_transform
 
 class TestUnknownKey(AATest):
     def AASetup(self):
@@ -35,6 +35,17 @@ class TestUnknownKey(AATest):
         with self.assertRaises(AppArmorBug):
             self.storage['foo'] = 'bar'
 
+class AaTest_var_transform(AATest):
+    tests = [
+        (['foo', ''],           'foo ""'        ),
+        (['foo', 'bar'],        'foo bar'       ),
+        ([''],                  '""'            ),
+        (['bar baz', 'foo'],    '"bar baz" foo' ),
+    ]
+
+    def _run_test(self, params, expected):
+        self.assertEqual(var_transform(params), expected)
+
 
 setup_all_loops(__name__)
 if __name__ == '__main__':