New upstream version

- update symbols file for new ABI
  - update copyright file
  - update ostree-boot packaging: the utilities in /usr/sbin moved to
    /usr/lib/ostree

debian/ostree-boot.install

@@ -4,5 +4,5 @@ lib/systemd/system/ostree-prepare-root.service
 lib/systemd/system/ostree-remount.service
 usr/lib/dracut/modules.d/98ostree
 usr/lib/ostree/grub2-15_ostree
-usr/sbin/ostree-prepare-root
-usr/sbin/ostree-remount
+usr/lib/ostree/ostree-prepare-root
+usr/lib/ostree/ostree-remount