Doc update to clarify random port mapping on docker run -P

Signed-off-by: Dan Cotora <d@bluevision.ro>
integcli: consolidate cmd exit code processing

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
integcli: add util to fetch container status

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
integcli: add & use dockerCmdWithTimeout & InDir

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #8123 from dcro/docs-clarifications

Updated the documentation to to clarify random port mapping when using -...
Merge pull request #7564 from unclejack/integcli-add_utils

integration cli: add some utility functions and use them