gluon-legacy: don't use generated scripts anymore

package/gluon-legacy/Makefile

package/gluon-legacy/files/lib/gluon/legacy/legacy-upgrade

...e/gluon-legacy/files/lib/gluon/legacy/legacy-upgrade-late

...b/gluon/upgrade/config-mode/legacy/010-migrate-configured

...-legacy/files/lib/gluon/upgrade/core/legacy/001-sysconfig

...acy/files/lib/gluon/upgrade/core/legacy/011-gluon-network

...n-legacy/files/lib/gluon/upgrade/core/legacy/020-wireless

.../lib/gluon/upgrade/lock-password/legacy/010-lock-password

...y/files/lib/gluon/upgrade/mesh-batman-adv/legacy/010-mesh

...luon/upgrade/mesh-vpn-fastd/legacy/010-reset-fastd-config

...y/files/lib/gluon/upgrade/simple-tc/legacy/010-migrate-tc

...age/gluon-legacy/generate/lib/gluon/legacy/legacy-upgrade

...luon-legacy/generate/lib/gluon/legacy/legacy-upgrade-late

...b/gluon/upgrade/config-mode/legacy/010-migrate-configured

...egacy/generate/lib/gluon/upgrade/core/legacy/020-wireless

...enerate/lib/gluon/upgrade/mesh-batman-adv/legacy/010-mesh

...luon/upgrade/mesh-vpn-fastd/legacy/010-reset-fastd-config

...enerate/lib/gluon/upgrade/simple-tc/legacy/010-migrate-tc