Daemon function for backup and restore of keys via webadmin

src/freedombone-installer

src/freedombone-keydrive

src/freedombone-recoverkey

src/freedombone-utils-keys

webadmin/EN/backup_keys_complete.html

webadmin/EN/backup_keys_failed.html

webadmin/EN/restore_keys_complete.html

webadmin/EN/restore_keys_failed.html