If API server doesn't publish supported Docker image versions, make that anerror instead of a warning (can be overridden with --force-image-format)refs #8567
8567: Bugfix check for existing repo+tag links.
8567: arv-keepdocker catches EPIPE so it doesn't print backtrace when piped toother commands such as "head".
8567: Add migrate19
8567: Better command line UI
8567: Add check that admin token is used and ensure that migration links arecreated owned by system user. Also fix tests now that arv-keepdocker useslogging instead of printing directly to sys.stderr.
8567: Add docker19 migration instructions to install guide.
8567: Fix migrate links to use PDH instead of UUID.
Better error reporting.
Migrate script cleans up /var/lib/docker inside container.
8567: Add check for ARVADOS_API_HOST_INSECURE
8567: Rename docker19-migrate to migrate-docker19 for consistency witharv-migrate-docker19. Add docstrict to migrate19() function.
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