swarmkit's API type. Make sure this parameter gets propagated to
swarmkit, and also add an extra option to the CLI when providing
external CAs to parse the CA cert from a file.
Signed-off-by: Ying Li <ying.li@docker.com>
This avoids issues when copy/pasting between different shells on
different OSes, which may not all support `\` as a continuation
character.
Fixes#32725
Signed-off-by: Dave Henderson <dhenderson@gmail.com>