Fixing bugs

[ikamman]

Hi I managed to fix some bugs which came up during using the tool.

Fix include:

• When using token authorisation the url for fetching the token is invalid. This will came up when your service name has spaces eg. "Docker Registry" in the registry:2 image configuration.
• Tool does not follow redirects correctly. Credentials used in previous call are not copied to the next one.
• S3 support. During calling for blob date registry redirects to the s3 resource with tokens available in parameters. In that case authorisation header should be removed.

Hope this helps someone.

[eed3si9n]

@ikamman Thanks for the contribution.