this improves the error message if a user tries to
create a volume with a single-character name:
Before this change:
docker volume create --name a
Error response from daemon: create a: "a" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed
After this change:
docker volume create --name a
Error response from daemon: create a: volume name is too short, names should be at least two alphanumeric characters
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
8d5a615045