api.lftp.on(): fix error path in `test_api_lftp_on()`

Signed-off-by: Oleg Verych <olecom@gmail.com>
sh.stderr.on('data'): buffer data until full string

fix all that chunck stuff all togathers
heads of chuncks has random length anyways

Signed-off-by: Oleg Verych <olecom@gmail.com>
changedModel(): `node` in 'wes4store' by model may be undefined

Signed-off-by: Oleg Verych <olecom@gmail.com>
fix f79600264dcb97b641ca70974829dde39bacce0a

Signed-off-by: Oleg Verych <olecom@gmail.com>
lftp `cache:enable false`: prevent not fresh file listings

Signed-off-by: Oleg Verych <olecom@gmail.com>
cnl: add possibly needed debug in `sh.stderr.on('data')`

via `App.backend.req('/suprolftpd/lib/cnl/do',{ cmd:"dev"})`

Signed-off-by: Oleg Verych <olecom@gmail.com>
test lftpd: api.lftp.send() + api.lftp.on()

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