fix sparse key delete when actor is removed

[justintsteele]

if an actor is removed when keys are stored in sparse mode, the sparse key data bag item does not get removed

Description

when a vault has keys stored in sparse mode

knife data bag show test_vault test_val_keys -F json
{
  "admins": [
    "jtsteele"
  ],
  "clients": [
    "jtsteele-client1.example.com",
    "jtsteele-client2.example.com"
  ],
  "id": "test_val_keys",
  "mode": "sparse",
  "search_query": "name:jtsteele*"
}

and we remove a client:

knife vault remove test_vault test_val -C jtsteele-client2.example.com

the clients list gets updated properly

knife data bag show test_vault test_val_keys -F json
{
  "admins": [
    "jtsteele"
  ],
  "clients": [
    "jtsteele-client1.example.com"
  ],
  "id": "test_val_keys",
  "mode": "sparse",
  "search_query": "name:jtsteele*"
}

but the sparse key data bag item still exists

knife data bag show test_vault -F json
[
  "test_val",
  "test_val_key_jtsteele-client1.example.com",
  "test_val_key_jtsteele-client2.example.com" <<<< should have been removed as well
  "test_val_key_jtsteele",
  "test_val_keys"
]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• If Gemfile.lock has changed, I have used --conservative to do it and included the full output in the Description above.
• All new and existing tests passed.
• All commits have been signed-off for [the Developer Certificate of Origin]

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud