Pulp

++ This bug was initially created as a clone of Bugzilla Bug #1112859 ++

Description of problem:

Description of problem: When trying to auto publish a repo using the export distributor there is no way to configure it except for via the API. Pulp-admin allows for --export and --export_dir but those must be run interactively and cannot be scheduled/auto published

Version-Release number of selected component (if applicable): 2.3

How reproducible: always

Steps to Reproduce:
1. create repo
2. use pulp-admin --export will only run export one time and is not scheduled. Auto publish does not have an option in pulp-admin

Actual results: export_dir is not configured and not saved in the database. because export_dir is not saved this causes exports to publish an iso to http(s) instead of exporting the packages to the filesystem

Expected results: repo exported to the filesystem after sync (auto_publish)

Additional info: Using the API the setting is configurable with
curl -E ~/pulp.pem -k -X PUT -d '{"distributor_config": {}, "delta": {"export_dir": "/repos/", "auto_publish": true }}' https://pulp/pulp/api/v2/repositories/rhel-7-workstation-optional-rpms-x86_64/distributors/export_distributor/

the request is accepted but upon retrieving the settings the export_dir is still not set

curl -E ~/pulp.pem -k -X GET https://pulp/pulp/api/v2/repositories/rhel-7-workstation-optional-rpms-x86_64/distributors/export_distributor/

{
"_id": {
"$oid": "53a9a36abbea5770c8d1cd42"
},
"_ns": "repo_distributors",
"auto_publish": true,
"config": {
"http": false,
"https": false
},
"distributor_type_id": "export_distributor",
"id": "export_distributor",
"last_publish": null,
"repo_id": "rhel-7-workstation-optional-rpms-x86_64",
"scheduled_publishes": [],
"scratchpad": null
}