s3: Prepare the first set of SMB_VFS_CREATE_FILE callers to take an smb_filename...

s3: Prepare the first set of SMB_VFS_CREATE_FILE callers to take an smb_filename struct

Some of the callers required minimal changes, while others
(copy_internals) required significant changes.  The task is simplified
a little bit because we are able to do operations and checks on the
base_name when a stream isn't used.

This patch should cause no functional changes.

Volker, Jeremy: Please check