support ADDRESSING_STYLE in sync_s3 command

[hosni]

I want to use sync_s3 command to sync my files over a s3 bucket.
I don't use AWS S3 and I use other S3 provider that does not support virtual addressing style (like: my-user.s3.provider.com) and uses path style adderssing (like: s3.provider.com/my-user)
So, it's good to support addresing style to support these type of buckets.