To follow best security practices and help fellow operators.

More details inline and in the linked bug report.

Closes-Bug: #1940547
Change-Id: Ide9e9009a6e272f20a43319f27d257efdf315f68

As agreed during IRC meeting. [1]

[1] http://eavesdrop.openstack.org/meetings/kolla/2021/kolla.2021-04-07-15.00.html

Change-Id: Ibffa019e2106784e97f5c482106bb5082f788752

Change-Id: I947c2940518c0f4872acaa977edeaca370dc9a96

Change-Id: I401a073eb6225e90b6f9d6b2a32f33d22d1d7a79

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