title: django.db.migrations.exceptions.InconsistentMigrationHistory error as part of 6.0.1 to 6.1 upgrade
body: <p>Environment: running Kiwi in docker containers from Docker repository on Windows Server 2016. I have not made changes to my clone of the Kiwi repo or the docker images.</p>
  
  <p>Repro:<br>
  1. Follow <a href="http://kiwitcms.org/blog/kiwi-tcms-team/2018/10/20/kiwi-tcms-61/" rel="nofollow noreferrer">upgrade steps</a> on blog to upgrade/migrate from Kiwi 6.0 to 6.0.1<br>
  2. Repeat steps to upgrade/migrate from Kiwi 6.0.1 to 6.1  </p>
  
  <p>Expect:<br>
  No errors</p>
  
  <p>Result:<br>
  Exception during migration, I clicked around my Kiwi instance after running the migrate command and didn't see anything obviously wrong with the data or associations between cases, plans and runs. But early days...</p>
  
  <p>Full call stack:  </p>
  
  <pre><code>C:\Kiwi&gt;docker exec -it kiwi_web /Kiwi/manage.py migrate
  Traceback (most recent call last):
    File "/Kiwi/manage.py", line 12, in &lt;module&gt;
      execute_from_command_line(sys.argv)
    File "/venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
      utility.execute()
    File "/venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
      self.fetch_command(subcommand).run_from_argv(self.argv)
    File "/venv/lib/python3.6/site-packages/django/core/management/base.py", line 316, in run_from_argv
      self.execute(*args, **cmd_options)
    File "/venv/lib/python3.6/site-packages/django/core/management/base.py", line 353, in execute
      output = self.handle(*args, **options)
    File "/venv/lib/python3.6/site-packages/django/core/management/base.py", line 83, in wrapped
      res = handle_func(*args, **kwargs)
    File "/venv/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 85, in handle
      executor.loader.check_consistent_history(connection)
    File "/venv/lib/python3.6/site-packages/django/db/migrations/loader.py", line 297, in check_consistent_history
      connection.alias,
  django.db.migrations.exceptions.InconsistentMigrationHistory: Migration management.0013_remove_env is applied before its dependency testruns.0019_remove_testruntag_user on database 'default'.
  </code></pre>