Add column IS_REPACK_VO and respective constraints to VIRTUAL_ORGANIZATION table

Summary

Added logic to allow enabling a default VO for repacking operations:

• Add column IS_REPACK_VO to VIRTUAL_ORGANIZATION table.
• Constraint IS_REPACK_VO to the values 0 or 1 (boolean).
• Constraint IS_REPACK_VO to the values 1 or NULL (boolean).
• Only allow one entry in the table to have a IS_REPACK_VO value of 1:
  • Achieved by adding a UNIQUE INDEX on NULLIF(IS_REPACK_VO, '0')
  • Achieved by adding a UNIQUE INDEX on IS_REPACK_VO (NULL entries will be ignored)

References

CTA#31 (closed)