Add test_sort_keys to test_yaml

tests/lib/test_yaml.py

diff --git a/tests/lib/test_yaml.py b/tests/lib/test_yaml.py
index 0927368..e26342d 100644
--- a/tests/lib/test_yaml.py
+++ b/tests/lib/test_yaml.py
@@ -11,6 +11,7 @@
 from test_representer import *
 from test_recursive import *
 from test_input_output import *
+from test_sort_keys import *
 
 if __name__ == '__main__':
     import test_appliance

tests/lib3/test_yaml.py

diff --git a/tests/lib3/test_yaml.py b/tests/lib3/test_yaml.py
index 0927368..e26342d 100644
--- a/tests/lib3/test_yaml.py
+++ b/tests/lib3/test_yaml.py
@@ -11,6 +11,7 @@
 from test_representer import *
 from test_recursive import *
 from test_input_output import *
+from test_sort_keys import *
 
 if __name__ == '__main__':
     import test_appliance