Instead of changing Docker daemon command line let's change config
for Docker instead. In /etc/docker/daemon.json file as it should be.

Custom Docker options can be set with 'docker_custom_config' variable.

Old 'docker_custom_option' is still present but should be avoided.

Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>
Change-Id: I1215e04ec15b01c0b43bac8c0e81293f6724f278

Change-Id: Icf3f01516185afb7b9f642407b06a0204c36ecbe
Closes-Bug: #1840315
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

Docker is now always installed using the community edition (CE)
packages.

Change-Id: I8c3fe44fd9d2da99b5bb1c0ec3472d7e1b5fb295

Change-Id: I89d9f7a90d72e6c5df7dde078ed7407eedd6f92f

Change-Id: I3bd50cb1e7db85acbf8ab20fc7bdd945b5232aaa