Bz improvements

- Redesign the UI so that we know we now have a distinction between errata bug and 'other' bugs
- We now rely on the mead scheduler REST endpoint to know if a package is shipped or not
- Rename the summary of the errata bug when the version in the package is changed
  e.g
  old version = 1.0.0
  new version = 1.0.1

  Change the summary from: "Upgrade pac to 1.0.0" to "Upgrade pac to 1.0.1" in the errata bug.