api: local.lftps = { } ; local.sh = '/bin/sh ...'

* move running lftps in own `local.lftps = { }`
* move script runner string in `local.sh` as it is a common setup

Signed-off-by: Oleg Verych <olecom@gmail.com>
api '/suprolftpd/lib/cnl/do': start, echo, quit

Signed-off-by: Oleg Verych <olecom@gmail.com>
lftpd.sh exit codes: change '1:'; add '76'

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