Skip tests that fail with newer versions of Python.

Patch copied from Gentoo:

https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-python/unittest2/files/unittest2-1.1.0-python3.5-test.patch

diff --git a/unittest2/test/test_loader.py b/unittest2/test/test_loader.py
index 683f662..347eea5 100644
--- a/unittest2/test/test_loader.py
+++ b/unittest2/test/test_loader.py
@@ -509,6 +509,7 @@ class Test_TestLoader(unittest2.TestCase):
     #
     # What happens when an impossible name is given, relative to the provided
     # `module`?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromName__relative_malformed_name(self):
         loader = unittest.TestLoader()
 
@@ -811,6 +812,7 @@ class Test_TestLoader(unittest2.TestCase):
     # TestCase or TestSuite instance."
     #
     # What happens when presented with an impossible module name?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromNames__malformed_name(self):
         loader = unittest2.TestLoader()
 
@@ -918,6 +920,7 @@ class Test_TestLoader(unittest2.TestCase):
     # "The method optionally resolves name relative to the given module"
     #
     # What happens when presented with an impossible attribute name?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromNames__relative_malformed_name(self):
         loader = unittest.TestLoader()
 
diff --git a/unittest2/compatibility.py b/unittest2/compatibility.py
index 9e5f1a5..2d20c19 100644
--- a/unittest2/compatibility.py
+++ b/unittest2/compatibility.py
@@ -140,6 +140,6 @@ except ImportError:
 ###  ChainMap (helper for configparser and string.Template)
 ########################################################################
 
-class ChainMap(collections.MutableMapping):
+class ChainMap(collections.abc.MutableMapping):
     ''' A ChainMap groups multiple dicts (or other mappings) together
     to create a single, updateable view.
e='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=fa7db21f5973bf3de06ec6418d230b1969d479a1&amp;showmsg=1'>root</a>/<a href='/guix/log/tests?id=fa7db21f5973bf3de06ec6418d230b1969d479a1&amp;showmsg=1'>tests</a>/<a href='/guix/log/tests/store-roots.scm?id=fa7db21f5973bf3de06ec6418d230b1969d479a1&amp;showmsg=1'>store-roots.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/store-roots.scm?id=fa7db21f5973bf3de06ec6418d230b1969d479a1'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2019-04-10 17:09:47 +0200'>2019-04-10</span></td><td class='logsubject'><a href='/guix/commit/tests/store-roots.scm?id=72eda0624be89ed18302fd7d7f22976071ab020c'>Add (guix store roots).</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* guix/store/roots.scm, tests/store-roots.scm: New files.
* Makefile.am (STORE_MODULES): Add guix/store/roots.scm.
(SCM_TESTS): Add tests/store-roots.scm.


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