fix update httpd log location in virtual host after nc-datadir

ncp-autoupdate: dont return 0 if no updates available

nc-info: change port checker providers

nc-update-nextcloud: make sure backup syncs to disk

nc-restore: refuse to restore from /var/www/nextcloud

nc-update-nextcloud: rollback in case of power cut

added nc-autoupdate-nc

nc-autoupdate-ncp: fix wrong user

nc-update-netcloud: include version in backup name

nc-backup: faster free space calculation. Minimize maintenance mode time