Remove unneeded Dockerfile from Santa

[andrewkroh]

What does this PR do?

The sample logs can be copied between volumes rather than added
to a layer in the image via a Dockerfile.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.

Related issues

• Relates Add automated tests for security packages #377

Screenshots

--- Test results for package: santa - START ---
╭─────────┬─────────────┬───────────┬────────────────────────────────────────────────────────────────────┬────────┬──────────────╮
│ PACKAGE │ DATA STREAM │ TEST TYPE │ TEST NAME                                                          │ RESULT │ TIME ELAPSED │
├─────────┼─────────────┼───────────┼────────────────────────────────────────────────────────────────────┼────────┼──────────────┤
│ santa   │             │ asset     │ dashboard santa-161855f0-ff6a-11e8-93c5-d5ecd1b3e307 is loaded     │ PASS   │ 8.876232674s │
│ santa   │             │ asset     │ visualization santa-11858000-ff6d-11e8-93c5-d5ecd1b3e307 is loaded │ PASS   │        486ns │
│ santa   │             │ asset     │ visualization santa-1579d690-ff6b-11e8-93c5-d5ecd1b3e307 is loaded │ PASS   │        376ns │
│ santa   │             │ asset     │ visualization santa-30962fe0-ff6c-11e8-93c5-d5ecd1b3e307 is loaded │ PASS   │        307ns │
│ santa   │             │ asset     │ visualization santa-51677b80-ff6b-11e8-93c5-d5ecd1b3e307 is loaded │ PASS   │        274ns │
│ santa   │             │ asset     │ visualization santa-b06c0460-ff6c-11e8-93c5-d5ecd1b3e307 is loaded │ PASS   │        262ns │
│ santa   │             │ asset     │ visualization santa-dad521d0-ff69-11e8-93c5-d5ecd1b3e307 is loaded │ PASS   │        308ns │
│ santa   │             │ asset     │ search santa-6d56a010-ff6a-11e8-93c5-d5ecd1b3e307 is loaded        │ PASS   │        280ns │
│ santa   │ log         │ asset     │ index_template logs-santa.log is loaded                            │ PASS   │        419ns │
│ santa   │ log         │ asset     │ ingest_pipeline logs-santa.log-0.0.1 is loaded                     │ PASS   │        297ns │
╰─────────┴─────────────┴───────────┴────────────────────────────────────────────────────────────────────┴────────┴──────────────╯
--- Test results for package: santa - END   ---
Done
Run pipeline tests for the package
--- Test results for package: santa - START ---
╭─────────┬─────────────┬───────────┬────────────────────┬────────┬──────────────╮
│ PACKAGE │ DATA STREAM │ TEST TYPE │ TEST NAME          │ RESULT │ TIME ELAPSED │
├─────────┼─────────────┼───────────┼────────────────────┼────────┼──────────────┤
│ santa   │ log         │ pipeline  │ test-santa-raw.log │ PASS   │  16.023818ms │
╰─────────┴─────────────┴───────────┴────────────────────┴────────┴──────────────╯
--- Test results for package: santa - END   ---
Done
Run system tests for the package
--- Test results for package: santa - START ---
╭─────────┬─────────────┬───────────┬───────────┬────────┬───────────────╮
│ PACKAGE │ DATA STREAM │ TEST TYPE │ TEST NAME │ RESULT │  TIME ELAPSED │
├─────────┼─────────────┼───────────┼───────────┼────────┼───────────────┤
│ santa   │ log         │ system    │ default   │ PASS   │ 21.235896837s │
╰─────────┴─────────────┴───────────┴───────────┴────────┴───────────────╯
--- Test results for package: santa - END   ---

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Build Cause: Pull request #595 opened

• • Start Time: 2021-01-31T16:49:39.312+0000

• Duration: 7 min 25 sec

• Commit: ca1f933

Test stats 🧪

Test	Results
Failed	0
Passed	12
Skipped	0
Total	12