[19.03 backport] Add docker interfaces to firewalld docker zone

[thaJeztah]

backport of https://github.com/moby/libnetwork/pull/2548

Fixes: https://github.com/moby/libnetwork/issues/2496 Addresses https://github.com/docker/for-linux/issues/957

If firewalld is running, create a new docker zone and add the docker interfaces to the docker zone to allow container networking for distros with firewalld enabled

[arkodg]

is this needed for 19.03 ?

[lining2020x]

any progress for this PR?

[akerouanton]

19.03 reached EOL so let me close this one.