import_export protected branches not honoured

Summary

When importing a project into a new EE instance, the protected branches are not set correctly causing no-one to have permission to push.

Steps to reproduce

  1. Export a project with protected branches.
  2. Import the project into a new instance
  3. Observer that the protected branches now have 0 roles or users

Expected behavior

Should continue to observe the original protected branches Screen_Shot_2017-02-06_at_13.15.00

Actual behavior

Does not include the correct roles or users Screen_Shot_2017-02-06_at_13.12.40

The current work around is to manually set the permissions after the import.

Results of GitLab environment info

GitLab Enterprise Edition 8.16.1-ee 060f824b