USN-6054-2: Django vulnerability

USN-6054-1 fixed a vulnerability in Django. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Moataz Al-Sharida and nawaik discovered that Django incorrectly handled
uploading multiple files using one form field. A remote attacker could
possibly use this issue to bypass certain validations.

advisory bypass django files issue ubuntu update usn vulnerability