S3FS

@sherakama likewise with #38, this should not affect existing installs; this just prepares us to be able to use S3FS. Depending on order of operations, this may or may not merge cleanly with the simplesamlphp branch.

Please do not delete this branch after merging.

(@mistermarco FYI)
I think this should be re-named to 7.x-2.x

This is an environment specific branch and we want to slowly get rid of this type of work. This is also the next version of this profile with a significant enough change it warrants the 2.x name.