Mock out getsyspath properly
Mock out getsyspath properly

As the in-memory filesystem raises an exception from getsyspath() method,
replace the method with a fake, that returns SYSPATH:<path>.

jonludlam/planex,simonjbeaumont/planex,jonludlam/planex,euanh/planex-cleanhistory,euanh/planex-cleanhistory,djs55/planex,djs55/planex,djs55/planex,euanh/planex-cleanhistory,jonludlam/planex,simonjbeaumont/planex,simonjbeaumont/planex