fix(sonic): docker log size

[vknabel]

for #285 (cc @iljarotar )

[robertvolkmann]

Could you also remove this nasty default for metal-core? https://github.com/metal-stack/metal-roles/blob/master/partition/roles/metal-core/defaults/main/main.yaml#L2

[Gerrit91]

Suggestion from @robertvolkmann was also to extend the systemd-docker-service role to include two new template variables for configuring --log-opt max-size and --log-opt max-file along with the existing --log-driver flag (maybe even set reasonable default in case log driver is json-file in order to prevent disks running full on the mgmt-servers for example).

The advantage would also be that we do not need to restart the Dockerd during the rollout.

What do you think?

[vknabel]

Applied your suggestions in https://github.com/metal-stack/ansible-common/pull/30 If systemd_docker_log_driver is not set, json-file will be the default. And in this case we limit the log files and size. So nothing to do here anymore.

[vknabel]

not required anymore