Description of problem:

During capsule sync  when shcma1 is requested pulp3 returns just
'7d0b1bbae291fbdaaa022e82da4addea932df9fa628493a2e3b31d3bd4443917'in the response `docker-content-digest` header.

This throws an error in pulp2:


  Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/celery/app/trace.py", line
367, in trace_task
      R = retval = fun(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py",
line 688, in __call__
      return super(Task, self).__call__(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py",
line 110, in __call__
      return super(PulpTask, self).__call__(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/celery/app/trace.py", line
622, in __protected_call__
      return self.run(*args, **kwargs)
    File
"/usr/lib/python2.7/site-packages/pulp/server/controllers/repository.py",
line 802, in sync
      sync_report = sync_repo(transfer_repo, conduit, call_config)
    File "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py",
line 905, in wrap_f
      return f(*args, **kwargs)
    File
"/usr/lib/python2.7/site-packages/pulp_docker/plugins/importers/importer.py",
line 86, in sync_repo
      return self.sync_step.process_lifecycle()
    File
"/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py",
line 573, in process_lifecycle
      super(PluginStep, self).process_lifecycle()
    File
"/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py",
line 164, in process_lifecycle
step.process()
    File
"/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py",
line 257, in process
self._process_block()
    File
"/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py",
line 304, in _process_block
self.process_main()
    File
"/usr/lib/python2.7/site-packages/pulp_docker/plugins/importers/sync.py",
line 231, in process_main
      manifests = self.parent.index_repository.get_manifest(tag)
    File
"/usr/lib/python2.7/site-packages/pulp_docker/plugins/registry.py", line
409, in get_manifest
      digest = self._digest_check(response_headers, manifest)
    File
"/usr/lib/python2.7/site-packages/pulp_docker/plugins/registry.py", line
436, in _digest_check
      digest = models.Manifest.calculate_digest(manifest,
expected_digest.split(':')[0])
    File
"/usr/lib/python2.7/site-packages/pulp_docker/plugins/models.py", line
142, in calculate_digest
      hasher = getattr(hashlib, algorithm)
  AttributeError: 'module' object has no attribute
'7d0b1bbae291fbdaaa022e82da4addea932df9fa628493a2e3b31d3bd4443917'


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:
response docker-content-digest header should contain "sha256:<hash>"

Expected results:


Additional info: