cfg: setup 'test.default' role for non dev testing

Signed-off-by: Oleg Verych <olecom@gmail.com>
view.LFTPD: handle app logic errors from `App.backend.req()`

Signed-off-by: Oleg Verych <olecom@gmail.com>
lftpd.sh: initial rewrite of boilerplate for new slave setup

Signed-off-by: Oleg Verych <olecom@gmail.com>