bugfix: ignore dreamhost 'auth' bucket

[sa7mon]

Not sure why, but trying to list the contents of a bucket named auth on Dreamhost returns a different type of error. Might be a different component of Openstack that receives the request?

Sending a GET to https://objects-us-east-1.dream.io/auth/ results in

HTTP/1.1 401 Unauthorized
content-length: 141
x-trans-id: tx00000bd4d41fac11b52eb-006503c7ee-d794c070-us-east-1-iad1
x-openstack-request-id: tx00000bd4d41fac11b52eb-006503c7ee-d794c070-us-east-1-iad1
accept-ranges: bytes
content-type: application/json; charset=utf-8
date: Fri, 15 Sep 2023 02:56:46 GMT

{"Code":"AccessDenied","RequestId":"tx00000bd4d41fac11b52eb-006503c7ee-d794c070-us-east-1-iad1","HostId":"d794c070-us-east-1-iad1-us-east-1"}

versus this response for any other bucket name

HTTP/1.1 404 Not Found
content-length: 239
x-amz-request-id: tx000001ca65fa2eb086d27-006503c7f4-d794c070-us-east-1-iad1
accept-ranges: bytes
content-type: application/xml
date: Fri, 15 Sep 2023 02:56:52 GMT

<?xml version="1.0" encoding="UTF-8"?><Error><Code>NoSuchBucket</Code><BucketName>auth2</BucketName><RequestId>tx000001ca65fa2eb086d27-006503c7f4-d794c070-us-east-1-iad1</RequestId><HostId>d794c070-us-east-1-iad1-us-east-1</HostId></Error>

This PR adds a list of "forbidden" bucket names to the Dreamhost provider. When encountered, these bucket names will be marked as "don't exist".

Closes #149

[github-actions]

Package	Line Rate	Complexity	Health
github.com/sa7mon/s3scanner/bucket	90%	0	✔
github.com/sa7mon/s3scanner/cmd/regioncheck	57%	0	➖
github.com/sa7mon/s3scanner/cmd/s3scanner	19%	0	❌
github.com/sa7mon/s3scanner/db	73%	0	➖
github.com/sa7mon/s3scanner/permission	77%	0	✔
github.com/sa7mon/s3scanner/provider	81%	0	✔
github.com/sa7mon/s3scanner/worker	49%	0	❌
Summary	64% (536 / 836)	0	➖