Running the two versions of the test in parallel is safe because they run
in separate processes, and a good idea because it cuts the time taken by
the test in half, from 36sec to 19sec.
This will be useful when we want to be smart with windows file paths later
Also, all of the file calls are asynchronous with fibers now, which comes with
many benefits.
This is a combination of 23 commits. Original messages:
Wrap a large number of fs calls inside files.*
Convert a few more fs calls to files.*
More moving fs.* to files
Implement read/write streams and open/read/close
Get rid of fs from auth.js
Remove fs and unused imports from catalog-local and catalog-remote
Remove unused imports from catalog.js
Replace a whole lot of fs calls
Fix error
Migrate a lot more fs. calls to files.
Add a temporary symlink method
Convert old test to files.*
Use files.pathX instead of path.x everywhere
Replace path.x to files.pathX in tests
Small fixes to files.js and one rename
Make cleanup run in a fiber
Make wrapping functions take function name in case we need it
Add some timeouts and stuff to HCP tests
wrapFsFunc also makes a sync version of the function
Sometimes you just don't want to yield!
Make sure JsImage readFromDisk doesn't yield
Remove unused imports from npm test
Change order of test now that some things don't yield
Fix missing files import, and add a debug error printout
