fix: redact secretKey from printed on screen

[allanrogerr]

Description

secretKey should not appear in logs.

Motivation and Context

Users may copy/paste logs inadvertently sharing privileges access information.

How to test this PR?

secretKey should not appear when running mc commands with debug e.g. mc alias set ALIAS URL ACCESSKEY SECRETKEY --debug

Example:

➜  mc git:(redact-alias-set) ✗ sudo ./mc alias import myminio-invalid invalid.json --debug --insecure

mc: <ERROR> Invalid secret key `hideme`. Invalid arguments provided, please refer `mc <command> -h` for relevant documentation.
 (0) alias-import.go:98 cmd.checkCredentialsSyntax(..) Tags: [hideme]

versus

mc: <ERROR> Invalid secret key. Invalid arguments provided, please refer `mc <command> -h` for relevant documentation.
 (0) alias-import.go:98 cmd.checkCredentialsSyntax(..)

Example:

➜  mc git:(redact-alias-set) ✗ sudo ./mc alias set myminio http://127.0.0.1:9000 minioadmin hideme --debug --insecure

mc: <ERROR> Unable to initialize new alias from the provided credentials. The request signature we calculated does not match the signature you provided. Check your key and signing method.
 (5) alias-set.go:343 cmd.mainAliasSet(..) Tags: [myminio, http://127.0.0.1:9000, minioadmin, hideme]
 (4) alias-set.go:259 cmd.BuildS3Config(..) Tags: [http://127.0.0.1:9000, minioadmin, , auto]
 (3) alias-set.go:229 cmd.probeS3Signature(..) Tags: [s3v4, s3v2]
 (2) alias-set.go:221 cmd.probeS3Signature.func1(..) Tags: [s3v2]
 (1) client-s3.go:1586 cmd.(*S3Client).Stat(..) Tags: [probe-bucket-sign-3vvwmuuhba0a]
 (0) client-s3.go:2218 cmd.(*S3Client).bucketStat(..)

versus

mc: <ERROR> Unable to initialize new alias from the provided credentials. The request signature we calculated does not match the signature you provided. Check your key and signing method.
 (5) alias-set.go:343 cmd.mainAliasSet(..) Tags: [myminio, http://127.0.0.1:9000, minioadmin]
 (4) alias-set.go:259 cmd.BuildS3Config(..) Tags: [http://127.0.0.1:9000, minioadmin, , auto]
 (3) alias-set.go:229 cmd.probeS3Signature(..) Tags: [s3v4, s3v2]
 (2) alias-set.go:221 cmd.probeS3Signature.func1(..) Tags: [s3v2]
 (1) client-s3.go:1586 cmd.(*S3Client).Stat(..) Tags: [probe-bucket-sign-gpcj9ot2e4jb]
 (0) client-s3.go:2218 cmd.(*S3Client).bucketStat(..)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• 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)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here