Post-release version bump for new dev cycle

Signed-off-by: NEric Blake <eblake@redhat.com>

configure.ac

@@ -16,7 +16,7 @@ dnl You should have received a copy of the GNU Lesser General Public
 dnl License along with this library.  If not, see
 dnl <http://www.gnu.org/licenses/>.
 
-AC_INIT([libvirt], [1.2.7], [libvir-list@redhat.com], [], [http://libvirt.org])
+AC_INIT([libvirt], [1.2.8], [libvir-list@redhat.com], [], [http://libvirt.org])
 AC_CONFIG_SRCDIR([src/libvirt.c])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_HEADERS([config.h])