Renames reset password test class

tracim/tracim/tests/library/test_resetpassword.py

 from tracim.tests import TestStandard
 
 
-class TestSerializers(TestStandard):
+class TestResetPassword(TestStandard):
     application_under_test = 'nosmtp'
 
     def test_unit__plain_send_mail__ok(self):