NSFS | Support anonymous NSFS requests

[naveenpaul1]

Explain the changes

1. Support anonymous NSFS requests
2. add CLI for add/updat/delete/status the anonymous account
3. Ceph test test_post_object_wrong_bucket added to black list
4. load_requesting_account() will load account from anonymous account. UID and GID or distinguished_name from anonymous account use for this.
5. anonymous user to account_cache with empty access key and for that read_account_by_access_key() method is updated

Issues: Fixed #xxx / Gap #xxx

1. Changes added to support anonymous request in namespace store
2. remove namesapce store check in code that prevent anonymous request

Testing Instructions:

1. Add anonymous account
   node src/cmd/manage_nsfs account add --anonymous --uid {uid} --gid {gid}
2. Create Bucket with policy that support anonymous request
   { Effect: 'Allow', Principal: { AWS: ["*"] }, Action: ['s3:GetObject', 's3:ListBucket'], Resource: ['arn:aws:s3:::*'] }
3. access object item using anonymous s3 request

• Doc added/updated
• Tests added

[romayalon]

Hi @naveenpaul1 :)
This week I added the test_s3_bucket_policy.js to the Non Containerized tests, I saw some anonymous tests in this tests file and skipped them, can you please check it and unskip the relevant tests?
reference - #8022

[romayalon]

@naveenpaul1 Thanks for the hard work on this one!!!

[guymguym]

just few comments left, but all in all this is looks great to me.