Handles missed comments in PR#10622 and adds an API test to validate error returned properly for duplicate bind mounts for the same container target path. Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp) Upstream-commit: 35d48258384a07affac6f49b89a70dd7ffa60428 Component: engine