python3Packages.tempest: remove unittest2 requirement

pkgs/development/python-modules/tempest/default.nix

@@ -1,6 +1,7 @@
 { lib
 , buildPythonApplication
 , fetchPypi
+, fetchpatch
 , pbr
 , cliff
 , jsonschema
@@ -20,7 +21,6 @@
 , prettytable
 , urllib3
 , debtcollector
-, unittest2
 , hacking
 , oslotest
 , bash
@@ -36,6 +36,14 @@ buildPythonApplication rec {
     sha256 = "0521d3042360c0fb469b16f99174a9abddbae8a2d2a81268cfc664f1ccfdd0f9";
   };
 
+  patches = [
+    # remove need for unittest2
+    (fetchpatch {
+      url = "https://github.com/openstack/tempest/pull/32/commits/cd3745c27b7d8fcdaffc72b965a3d803d9ee12c2.patch";
+      sha256 = "sha256-UwUmyFZokH66Xqfsj982MBHb0w7x6v4SAtXlqA5dpnk=";
+    })
+  ];
+
   propagatedBuildInputs = [
     pbr
     cliff
@@ -56,7 +64,6 @@ buildPythonApplication rec {
     prettytable
     urllib3
     debtcollector
-    unittest2
   ];
 
   checkInputs = [