Fix basic python3 issues in test_02_saml

- Strings/bytes encoding/decoding where necessary.
- Random hash seed producing test fails sometimes on keys(), sorting
  lists fixes this.

src/saml2/saml.py

@@ -119,7 +119,7 @@ def _verify_value_type(typ, val):
     if typ == XSD + "base64Binary":
         import base64
 
-        return base64.decodestring(val)
+        return base64.decodestring(val.encode('utf-8'))
 
 
 class AttributeValueBase(SamlBase):

tests/test_02_saml.py

@@ -183,7 +183,7 @@ class TestExtensionContainer:
         ec = saml2.ExtensionContainer()
         ec.add_extension_attribute("foo", "bar")
         assert len(ec.extension_attributes) == 1
-        assert ec.extension_attributes.keys()[0] == "foo"
+        assert list(ec.extension_attributes.keys())[0] == "foo"
 
 
 class TestSAMLBase:
@@ -216,13 +216,14 @@ class TestSAMLBase:
 
         attr = Attribute()
         saml2.make_vals(ava, AttributeValue, attr, prop="attribute_value")
-        assert attr.keyswv() == ["name_format", "attribute_value"]
+        assert sorted(attr.keyswv()) == sorted(["name_format",
+                                                "attribute_value"])
         assert len(attr.attribute_value) == 4
 
     def test_to_string_nspair(self):
         foo = saml2.make_vals("lions", AttributeValue, part=True)
-        txt = foo.to_string()
-        nsstr = foo.to_string({"saml": saml.NAMESPACE})
+        txt = foo.to_string().decode('utf-8')
+        nsstr = foo.to_string({"saml": saml.NAMESPACE}).decode('utf-8')
         assert nsstr != txt
         print(txt)
         print(nsstr)
@@ -1215,4 +1216,4 @@ class TestAssertion:
 
 if __name__ == "__main__":
     t = TestSAMLBase()
-    t.test_make_vals_multi_dict()
+    t.test_make_vals_multi_dict()