Pin containerd version to <=1.4.3-1 to avoid containers getting stuck in "Created" state

[jakommo]

We've recently seen several occurrences of ECE users that had issue with containers getting stuck in "Created" state and traced it down to this upstream issue opencontainers/runc#2871.

For now we should pin the containerd version to <=1.4.3-1 to avoid that the affected runc gets used.
As far as I can see, this would affect at least:

ansible-elastic-cloud-enterprise/vars/os_CentOS_7.yml

Line 13 in c9f63f9

- containerd.io

ansible-elastic-cloud-enterprise/vars/os_Ubuntu_18.yml

Line 12 in c9f63f9

- containerd.io

ansible-elastic-cloud-enterprise/vars/os_CentOS_8.yml

Line 13 in c9f63f9

- containerd.io

ansible-elastic-cloud-enterprise/vars/os_RedHat_8.yml

Line 13 in c9f63f9

- containerd.io

Not sure about the others.

[obierlaire]

Fixed by #125