rpm: fix upgrades when RBD is disabled in a new version

We previously had to disable RBD on 32-bit platforms since Ceph has
dropped all support for 32-bit. Unfortunately anyone with the RPM
libvirt-daemon-driver-storage-rbd installed on 32-bit now has a
broken upgrade path.

To fix this we must make libvirt-daemon-driver-storage-core
have an Obsoletes: libvirt-daemon-driver-storage-rbd < $VER-$REL
Reviewed-by: NErik Skultety <eskultet@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

libvirt.spec.in

@@ -550,6 +550,9 @@ Requires: util-linux
 # From QEMU RPMs
 Requires: /usr/bin/qemu-img
 %endif
+%if !%{with_storage_rbd}
+Obsoletes: libvirt-daemon-driver-storage-rbd < %{version}-%{release}
+%endif
 
 %description daemon-driver-storage-core
 The storage driver plugin for the libvirtd daemon, providing