[bfss] convert root BFSS directory to str in constructor (closes #2137793)
otherwise you can get crashed with AssertionError: Binary objects must use raw strings, not <type 'unicode'>
[system]
db-driver = postgres
db-host = localhost
db-port = 5433
adapter = native
db-name = cw_fti_test
db-encoding = UTF-8
db-user = syt
db-password = syt
[admin]
login = admin
password = gingkow