Squashed 'floo/common/' changes from ae53363..b8bfdfa

b8bfdfa Handle new workspace URLs.
758f2a5 Fixed inconsistent import of reactor
259d73d no more import errors in python3, but mysterious failures remain.
77b5adc fixed creating new workspace bugs.  Now check permisssions before sending stuff.

git-subtree-dir: floo/common
git-subtree-split: b8bfdfae5834ce76bbf0c3732c204562eed8436b
pull in changes from upstream (fix imports)