connman: don't remove scripts directory if it's not empty

The scripts directory has some content when VPN support is activated:

OE @webos ~/data/oe/webos-ports-setup/webos-ports $ ls [...]/image/usr/lib/connman/scripts
openconnect-script

Signed-off-by: Simon Busch <morphis@gravedo.de>
classes: add simple bbclass to extend package meta data for device/luna restart

Signed-off-by: Simon Busch <morphis@gravedo.de>
org.webosinternals.service.update: package needs a device restart after an upgrade

Signed-off-by: Simon Busch <morphis@gravedo.de>