Upgrade: Data migration (dump-restore) script modularized

[katkamrachana]

1. User-data (GSystems / artifacts) export and import
2. Node level export and import

[kedar2a]

Test cases:

• Import and Export of following entities:

  • Node

    • python manage.py node_export <_id>
    • python manage.py node_import

  • Group

  • Module

    • python manage.py group_export <_id>
    • python manage.py group_import <PATH>

  • User data

    • python manage.py user_data_export <group _id>
    • python manage.py user_data_import <PATH>

---

TEST CASES:

node_export

• Print path of exported node folder
• Deal with ascii char print statements.

node_import

• edited name is not getting reset from provided node's content.
• ascii name
• Comment's merging.
• Restoring of purged node.

group_import

• User blog and comments under it got restored.
• Asset and underlying asset_content have not got restored.
• Found change in timestamp, i.e: created_at, not of original and not even of restore/import time.

[gnowgi]

@DurgaSwetha Can you please test these functions ?