text: Title: Failure messages
  Body: We are trying a simple test.  while verifying the response  i got error
  in verify
  ```
      raise TestFailError("Test '{:s}' failed:\n{:s}".format(self.name, self._str_errors()), failures=self.errors)
  vern.util.exceptions.TestFailError: Test '23_03_Post P1 V1' failed:
  E   - Value mismatch in body: Type of returned data was different than expected (expected["0"]["biosStartAddress"] = '3022853549', actual["0"]["biosStartAddress"] = '3022853549')                    
  
  ##############################################################################
  
  
  ================================================= test session starts ================================================= platform win32 -- Python 3.5.0, pytest-4.0.0, py-1.7.0, pluggy-0.8.0 -- c:\python35-32\python.exe
  cachedir: .pytest_cache
  rootdir: E:\Tavern\BIOS\AttestationMeasurementService, inifile:
  plugins: tavern-0.20.0
  collected 1 item
  
  test_Test.tavern.yaml::Test_23_ Put  B1 P1 V1 and B1 P2 V1 should be allowed FAILED                              [100%]
  ====================================================== FAILURES =======================================================
   E:\Tavern\BIOS\AttestationMeasurementService\test_Test.tavern.yaml::Test_23_ Put  B1 P1 V1 and B1 P2 V1 should be allowed
  c:\python35-32\lib\site-packages\_pytest\runner.py:211: in __init__                                                         self.result = func()                                                                                                c:\python35-32\lib\site-packages\_pytest\runner.py:193: in <lambda>
      lambda: ihook(item=item, **kwds),
  c:\python35-32\lib\site-packages\pluggy\hooks.py:284: in __call__
      return self._hookexec(self, self.get_hookimpls(), kwargs)
  c:\python35-32\lib\site-packages\pluggy\manager.py:67: in _hookexec
      return self._inner_hookexec(hook, methods, kwargs)
  c:\python35-32\lib\site-packages\pluggy\manager.py:61: in <lambda>
      firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
  c:\python35-32\lib\site-packages\pluggy\callers.py:208: in _multicall
      return outcome.get_result()
  c:\python35-32\lib\site-packages\pluggy\callers.py:80: in get_result
      raise ex[1].with_traceback(ex[2])                                                                                   c:\python35-32\lib\site-packages\pluggy\callers.py:187: in _multicall
      res = hook_impl.function(*args)
  c:\python35-32\lib\site-packages\_pytest\runner.py:121: in pytest_runtest_call
      item.runtest()
  c:\python35-32\lib\site-packages\tavern\testutils\pytesthook.py:431: in runtest
      run_test(self.path, self.spec, self.global_cfg)
  c:\python35-32\lib\site-packages\tavern\core.py:145: in run_test
      run_stage_(sessions, stage, tavern_box, test_block_config)
  c:\python35-32\lib\site-packages\tavern\core.py:180: in run_stage
      saved = v.verify(response)
  c:\python35-32\lib\site-packages\tavern\_plugins\rest\response.py:207: in verify
      raise TestFailError("Test '{:s}' failed:\n{:s}".format(self.name, self._str_errors()), failures=self.errors)
  E   tavern.util.exceptions.TestFailError: Test '23_03_Post P1 V1' failed:
  E   - Value mismatch in body: Type of returned data was different than expected (expected["0"]["biosStartAddress"] = '3022853549', actual["0"]["biosStartAddress"] = '3022853549')                                                              -------------------------------------------------- Captured log call --------------------------------------------------
  base.py                     37 ERROR    Value mismatch in body: Type of returned data was different than expected (expected["0"]["biosStartAddress"] = '3022853549', actual["0"]["biosStartAddress"] = '3022853549')                            =============================================== short test summary info =============================================== FAIL test_Test.tavern.yaml::Test_23_ Put  B1 P1 V1 and B1 P2 V1 should be allowed
  ============================================== 1 failed in 1.70 seconds ===============================================
  ```