hostname is not defined correctly in machines

[zetaab]

1. What kops version are you running? The command kops version, will display
this information.

master

2. What Kubernetes version are you running? kubectl version will print the
version if a cluster is running or provide the Kubernetes version specified as
a kops flag.

1.11.6

3. What cloud provider are you using?
openstack

4. What commands did you run? What is the simplest way to reproduce this issue?

kops create cluster \
  --cloud openstack \
  --name oma.k8s.local \
  --state ${KOPS_STATE_STORE} \
  --zones nova \
  --network-cidr 10.1.0.0/16 \
  --image ubuntu \
  --master-count=3 \
  --node-count=1 \
  --node-size m1.small \
  --master-size m1.small \
  --etcd-storage-type lvmdriver-1 \
  --api-loadbalancer-type public \
  --topology private \
  --bastion \
  --networking weave \
  --os-ext-net public --yes

5. What happened after the commands executed?

After cluster is up and running, each instance hostname is same called oma.

6. What did you expect to happen?

I except that each instance should have its own exact same hostname that exist in cloudprovider api (in this case openstack). Example: oma.k8s.local-master-nova-1-1 or oma.k8s.local-master-nova-2-1 and so on. Should we insert this to cloud-init?

/kind bug

[zetaab]

solved by replacing dots with - in hostnames