hide logdir

prepend log Directory w/ '_' so that it will not be interpreted as a Project Directory when running 

python /usr/Roam/src/roam/ --projectroot $DIR

from Directory /usr/foo

where /usr/foo contains Project directories.A and B, and /usr/foo is also where the log Directory is created.

Fixes warning when running roam under this Scenario that says cannot find log/settings.config