Remove unneeded Dockerfile from o365

[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

Run asset tests for the package
--- Test results for package: o365 - START ---
╭─────────┬─────────────┬───────────┬───────────────────────────────────────────────────────────────────┬────────┬──────────────╮
│ PACKAGE │ DATA STREAM │ TEST TYPE │ TEST NAME                                                         │ RESULT │ TIME ELAPSED │
├─────────┼─────────────┼───────────┼───────────────────────────────────────────────────────────────────┼────────┼──────────────┤
│ o365    │             │ asset     │ dashboard o365-712e2c00-685d-11ea-8d6a-292ef5d68366 is loaded     │ PASS   │ 7.250520373s │
│ o365    │             │ asset     │ visualization o365-0be1adb0-6860-11ea-8d6a-292ef5d68366 is loaded │ PASS   │        683ns │
│ o365    │             │ asset     │ visualization o365-897d0c70-6869-11ea-8d6a-292ef5d68366 is loaded │ PASS   │        362ns │
│ o365    │             │ asset     │ visualization o365-8b033510-685a-11ea-8d6a-292ef5d68366 is loaded │ PASS   │        347ns │
│ o365    │             │ asset     │ visualization o365-d43c95a0-6864-11ea-8d6a-292ef5d68366 is loaded │ PASS   │        387ns │
│ o365    │             │ asset     │ search o365-8b8e5a10-6886-11ea-8d6a-292ef5d68366 is loaded        │ PASS   │      2.005µs │
│ o365    │             │ asset     │ search o365-fdc14020-6859-11ea-8d6a-292ef5d68366 is loaded        │ PASS   │        308ns │
│ o365    │             │ asset     │ map o365-dbae13c0-685c-11ea-8d6a-292ef5d68366 is loaded           │ PASS   │        392ns │
│ o365    │ audit       │ asset     │ index_template logs-o365.audit is loaded                          │ PASS   │        387ns │
│ o365    │ audit       │ asset     │ ingest_pipeline logs-o365.audit-0.2.6 is loaded                   │ PASS   │        344ns │
╰─────────┴─────────────┴───────────┴───────────────────────────────────────────────────────────────────┴────────┴──────────────╯
--- Test results for package: o365 - END   ---
Done
Run pipeline tests for the package
--- Test results for package: o365 - START ---
No test results
--- Test results for package: o365 - END   ---
Done
Run system tests for the package
--- Test results for package: o365 - START ---
╭─────────┬─────────────┬───────────┬───────────┬────────┬───────────────╮
│ PACKAGE │ DATA STREAM │ TEST TYPE │ TEST NAME │ RESULT │  TIME ELAPSED │
├─────────┼─────────────┼───────────┼───────────┼────────┼───────────────┤
│ o365    │ audit       │ system    │ default   │ PASS   │ 55.942750767s │
╰─────────┴─────────────┴───────────┴───────────┴────────┴───────────────╯
--- Test results for package: o365 - END   ---

[elasticmachine]

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

[elasticmachine]

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Build stats

• Build Cause: Pull request #591 opened

• • Start Time: 2021-01-31T16:16:40.586+0000

• Duration: 8 min 9 sec

• Commit: 04f2df4

Test stats 🧪

Test	Results
Failed	0
Passed	11
Skipped	0
Total	11