Use 192.168.3.9* addresses for dev-spec
Set dev.yml same as itest.yml
Add comment and link about dev.yml settings

However, the link is not yet available, because not merged.
See https://github.com/master-q/wakame-ci-cluster/tree/663a2d01dad38ed5b8fff862cf82b6aceea0664c/kvm-guests/192.168.3.91-vteskins.
Merge pull request #54 from axsh/feature-use-192_168_3_net-on-dev-spec

Use dev.yml settings for running integration-test on local PC