Add support for --connection

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* override --url and/or --identity fields from containers.conf
* --connection flag has higher precedence than ActiveService from
containers.conf. Which is set via podman system connection default
* Add newline to error message printed on stderr
* Added --connection to bash completion and documentation
* Updated bindings to query server in case of no path or /

Closes #jira-991
Fixes #7276

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Signed-off-by: Jhon Honce <jhonce@redhat.com>

Squashed commits to work around CI issue

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