vcontainer: default to --network=host for container run

Docker bridge networking is intentionally disabled in vdkr (dockerd runs
with --bridge=none --iptables=false). Rather than requiring users to
explicitly add --network=host to every container run command, make it
the default.

This simplifies port forwarding workflows:
  vdkr memres start -p 8080:80
  vdkr run -d --rm nginx:alpine    # Just works, no --network=host needed

Users can still override with --network=none if they explicitly want
no networking.

Updates help text and examples to reflect the new default.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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