make buildbot to include galera into bintars

Currently bintars that buildbot produces don't contain libgalera_smm.so.

Publishing scripts repackage bintars to add it.

We want to produce correct packages in buildbot and release exactly what buildbot builds.

Either cpack should pick up libgalera_smm.so and add it to bintar or buildbot needs to repackage bintars itself.