cleanup: use isinstance instead of comparing types

From 2to3 idioms.

kallithea/lib/rcmail/response.py

@@ -422,7 +422,7 b' def header_to_mime_encoding(value, not_e'
         return ""
 
     encoder = Charset(DEFAULT_ENCODING)
-    if type(value) == list:
+    if isinstance(value, list):
         return separator.join(properly_encode_header(
             v, encoder, not_email) for v in value)
     else:

kallithea/model/db.py

@@ -205,7 +205,7 b' class Setting(Base, BaseDbModel):'
 
     @validates('_app_settings_value')
     def validate_settings_value(self, key, val):
-        assert type(val) == unicode
+        assert isinstance(val, unicode)
         return val
 
     @hybrid_property

kallithea/tests/vcs/test_git.py

@@ -590,17 +590,17 b' class TestGitChangeset(object):'
 
     def test_commit_message_is_unicode(self):
         for cs in self.repo:
-            assert type(cs.message) == unicode
+            assert isinstance(cs.message, unicode)
 
     def test_changeset_author_is_unicode(self):
         for cs in self.repo:
-            assert type(cs.author) == unicode
+            assert isinstance(cs.author, unicode)
 
     def test_repo_files_content_is_unicode(self):
         changeset = self.repo.get_changeset()
         for node in changeset.get_node('/'):
             if node.is_file():
-                assert type(node.content) == unicode
+                assert isinstance(node.content, unicode)
 
     def test_wrong_path(self):
         # There is 'setup.py' in the root dir but not there:

kallithea/tests/vcs/test_hg.py

@@ -538,17 +538,17 b' class TestMercurialChangeset(object):'
 
     def test_commit_message_is_unicode(self):
         for cm in self.repo:
-            assert type(cm.message) == unicode
+            assert isinstance(cm.message, unicode)
 
     def test_changeset_author_is_unicode(self):
         for cm in self.repo:
-            assert type(cm.author) == unicode
+            assert isinstance(cm.author, unicode)
 
     def test_repo_files_content_is_unicode(self):
         test_changeset = self.repo.get_changeset(100)
         for node in test_changeset.get_node('/'):
             if node.is_file():
-                assert type(node.content) == unicode
+                assert isinstance(node.content, unicode)
 
     def test_wrong_path(self):
         # There is 'setup.py' in the root dir but not there: