This code used to assume that all arguments were strings.
It was always wrong (create was passed as '0' or '1' rather
than as 0 or 1) but this was somehow masked.  When I added
readonly, things broke.  The solution is that winserver.py
ha a convention that an argument starting with '=' is
evaluated as an expression, and _startserver in testZEO's
WindowsConnectionText uses this for the create and readonly
args.