archive.py state throws AttributeError when the 'f' flag is passed as a tar_option

[Line 158 of archive.py](https://github.com/saltstack/salt/blob/develop/salt/states/archive.py#L158) calls remove on an str object (as indicated by line 155) and throws an AttributeError when using an options string that contains 'f':

    Traceback (most recent call last):
      File "/root/salt/salt/state.py", line 1401, in call
        **cdata['kwargs'])
      File "/root/salt/salt/states/archive.py", line 159, in extracted
        tar_options.remove('f')
    AttributeError: 'str' object has no attribute 'remove'

My HSD looks like this (it is written for the python renderer):

      generated_hsd[full_local_path] = {
        'archive': [
          'extracted',
          { 'name': app['deploy']['path'] },
          { 'user': 'myuser' },
          { 'group': 'mygroup' },
          { 'mode': 400 },
          { 'source': 's3://{0}/{1}'.format(bucket, build_archive) },
          { 'source_hash': 'md5={0}'.format(build_hash) },
          { 'tar_options': 'xvf' },
          { 'archive_format': 'tar' },
          { 'if_missing': '{0}/{1}'.format(local_path, build) },
          { 'require': [
            { 'user': 'myuser' },
            { 'file': local_path }
          ]
          }
        ]
      }

This PR fixes the issue for me.