fix: Add missing return in admin requests auth

[vadmeste]

Description

Add missing return in admin requests auth, also add some units to cover more cases.

Motivation and Context

Fix auth issue

How to test this PR?

Trivial

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
• Functional tests needed (If yes, add mint PR # here: )

[harshavardhana]

🍰

[minio-trusted]

Mint Automation

Test	Result
mint-xl.sh	✔️
mint-large-bucket.sh	✔️
mint-worm.sh	✔️
mint-fs.sh	✔️
mint-dist-xl.sh	✔️
mint-gateway-azure.sh	❌ more...
mint-gateway-nas.sh	❌ more...

9422-0fde392/mint-gateway-azure.sh.log:

Running with
SERVER_ENDPOINT:      minio-dev7.minio.io:32465
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 b9c35b141f16:/mint/log /tmp/mint-logs'

(1/15) Running aws-sdk-go tests ... done in 7 seconds
(2/15) Running aws-sdk-java tests ... done in 1 seconds
(3/15) Running aws-sdk-php tests ... done in 1 minutes and 4 seconds
(4/15) Running aws-sdk-ruby tests ... done in 15 seconds
(5/15) Running awscli tests ... FAILED in 58 seconds
{
  "name": "awscli",
  "duration": 4020,
  "function": "aws --endpoint-url http://minio-dev7.minio.io:32465 s3api copy-object --bucket awscli-mint-test-bucket-22685 --storage-class REDUCED_REDUNDANCY --key datafile-1-kB-copy --copy-source awscli-mint-test-bucket-22685/datafile-1-kB\n",
  "status": "FAIL",
  "error": "An error occurred (NotImplemented) when calling the CopyObject operation: A header you provided implies functionality that is not implemented"
}

Executed 4 out of 15 tests successfully.

9422-0fde392/mint-gateway-nas.sh.log:

Running with
SERVER_ENDPOINT:      minio-dev7.minio.io:31690
ACCESS_KEY:           minio
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 bf4ec9022afb:/mint/log /tmp/mint-logs'

(1/15) Running aws-sdk-go tests ... done in 0 seconds
(2/15) Running aws-sdk-java tests ... done in 1 seconds
(3/15) Running aws-sdk-php tests ... done in 41 seconds
(4/15) Running aws-sdk-ruby tests ... done in 2 seconds
(5/15) Running awscli tests ... done in 2 minutes and 12 seconds
(6/15) Running healthcheck tests ... done in 0 seconds
(7/15) Running mc tests ... done in 27 seconds
(8/15) Running minio-dotnet tests ... done in 32 seconds
(9/15) Running minio-go tests ... FAILED in 26 seconds
{}

Executed 8 out of 15 tests successfully.

Deleting image on docker hub
Deleting image locally