recursive copy had a bug with relative local paths.
this fixes that bug and changes the test framework
to use more of the code that actually runs in uplink
and only mocks out the direct interaction with the
operating system.
Change-Id: I9da2a80bfda8f86a8d05879b87171f299f759c7e
When copying an object from cli you can now set the expiry.
It uses the same datetime format as restricting access grants.
Closes https://github.com/storj/storj/issues/4595
Change-Id: Icab73a64a9589817d6bc6d702b765b166ca1350d
