packaging: moved engine-backup into -tools

Moved engine-backup from -setup to -tools subpackage.
Note that engine-backup already needed -tools for using
engine-prolog.sh and we don't want -setup to depend on -tools.

Change-Id: I09d70101ca88b19a9c593017bcd3a3eda243d7a3
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>