remove unused putObjectDir code

[harshavardhana]

Description

remove unused putObjectDir code

Motivation and Context

now we support directories natively

How to test this PR?

Nothing special cosmetic change

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)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Documentation needed
• Unit tests needed

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-fs.sh	✔️
mint-gateway-s3.sh	✔️
mint-erasure.sh	✔️
mint-dist-erasure.sh	✔️
mint-zoned.sh	✔️
mint-gateway-nas.sh	✔️
mint-gateway-azure.sh	❌ more...

10528-1219a29/mint-gateway-azure.sh.log:

Running with
SERVER_ENDPOINT:      minio-c2.minio.io:30913
ACCESS_KEY:           minioazure
SECRET_KEY:           ***REDACTED***
ENABLE_HTTPS:         0
SERVER_REGION:        us-east-1
MINT_DATA_DIR:        /mint/data
MINT_MODE:            full
ENABLE_VIRTUAL_STYLE: 0

To get logs, run 'docker cp b0b5b3d6f46a:/mint/log /tmp/mint-logs'

(1/15) Running aws-sdk-go tests ... done in 8 seconds
(2/15) Running aws-sdk-java tests ... done in 2 seconds
(3/15) Running aws-sdk-php tests ... done in 1 minutes and 19 seconds
(4/15) Running aws-sdk-ruby tests ... done in 21 seconds
(5/15) Running awscli tests ... done in 2 minutes and 57 seconds
(6/15) Running healthcheck tests ... done in 0 seconds
(7/15) Running mc tests ... done in 3 minutes and 58 seconds
(8/15) Running minio-dotnet tests ... done in 1 minutes and 44 seconds
(9/15) Running minio-go tests ... done in 6 minutes and 27 seconds
(10/15) Running minio-java tests ... done in 10 minutes and 22 seconds
(11/15) Running minio-js tests ... done in 2 minutes and 37 seconds
(12/15) Running minio-py tests ... done in 19 minutes and 10 seconds
(13/15) Running s3cmd tests ... done in 2 minutes and 16 seconds
(14/15) Running s3select tests ... FAILED in 16 seconds
{
  "name": "s3select:test_csv_input_quote_char",
  "function": "select_object_content(bucket_name, object_name, opts)",
  "args": {
    "bucket_name": "s3select-test-ece834a8-6b96-459c-9442-b09735d4bd27"
  },
  "duration": 15639,
  "message": "Test test_18 unexpectedly failed with: 'event-type'",
  "error": "Traceback (most recent call last):\n  File \"/mint/run/core/s3select/csv.py\", line 39, in test_sql_api\n    for d in data.stream(10*1024):\n  File \"/usr/local/lib/python3.6/dist-packages/minio/select/reader.py\", line 211, in stream\n    message = self.__extract_message()\n  File \"/usr/local/lib/python3.6/dist-packages/minio/select/reader.py\", line 161, in __extract_message\n    event_type = header_map[\"event-type\"]\nKeyError: 'event-type'\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"./tests.py\", line 52, in main\n    test_csv_input_custom_quote_char(client, log_output)\n  File \"/mint/run/core/s3select/csv.py\", line 119, in test_csv_input_custom_quote_char\n    data, sql_opts, expected_output)\n  File \"/mint/run/core/s3select/csv.py\", line 45, in test_sql_api\n    'Test {} unexpectedly failed with: {}'.format(test_name, select_err))\nValueError: Test test_18 unexpectedly failed with: 'event-type'\n",
  "status": "FAIL"
}
(14/15) Running security tests ... done in 0 seconds

Executed 14 out of 15 tests successfully.

Deleting image on docker hub
Deleting image locally
Error: No such image: minio/minio:10528-1219a29