[CASTOR migration] Added a script for completing the process (#479).

Also, packaged the python scripts in the same cta-migration RPM.
The scripts are still WIP.

cta.spec.in

@@ -314,6 +314,8 @@ directory metadata into the EOS namespace.
 %attr(0755,root,root) %{_bindir}/json-pretty-print.sh
 %attr(0755,root,root) %{_bindir}/exporttapepool.sh
 %attr(0755,root,root) %{_bindir}/undoexporttapepool.sh
+%attr(0755,root,root) %{_bindir}/tapepool_castor_to_cta.py
+%attr(0755,root,root) %{_bindir}/complete_tapepool_export.py
 %attr(0644,root,root) %config(noreplace) %{_sysconfdir}/cta/castor-migration.conf.example
 
 %package -n cta-rmcd