USN-6042-2: Cloud-init regression

USN-6042-1 fixed a vulnerability in Cloud-init. The update introduced a
regression on Ubuntu 20.04 LTS resulting in a possible loss of networking.
This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

James Golovich discovered that sensitive data could be exposed in logs. An
attacker could use this information to find hashed passwords and possibly
escalate their privilege.