[BUG] Add validation to check hostnames for on-prem deployment

[rafzei]

Describe the bug
Deployment on-prem cluster failed due to the wrong hostname format.

kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]\\nnodeRegistration.name: 
Invalid value: \\\"apm_master\\\": a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')\\n

Check validations for provider: any
currently, we have (https://github.com/epiphany-platform/epiphany/blob/develop/schema/any/validation/infrastructure/machine.yml):

  properties:
    hostname:
      type: string
    ip:
      type: string

Proposal is to use the above regex as a pattern

Expected behavior
Validation should find wrong hostnames just before cluster setup

Environment

• Found during on-prem deployment
• OS: Ubuntu 18.04

epicli version: [epicli --version]
Found in v0.8.3 version but as I see in develop is still the same
K8s 1.18.6

---

DoD checklist

• Changelog updated (if affected version was released)
• COMPONENTS.md updated / doesn't need to be updated
• Automated tests passed (QA pipelines)
  • apply
  • upgrade
• Case covered by automated test (if possible)
• Idempotency tested
• Documentation updated / doesn't need to be updated
• All conversations in PR resolved
• Backport tasks created / doesn't need to be backported

[atsikham]

There are already similar validations that can be used as example. I remember that I did something similar and it worked for sure - https://github.com/epiphany-platform/epiphany/pull/1814/files.

Also check this doc.

[przemyslavic]

✔️ Hostname validation for any provider has been added.
A DNS-1123 subdomain must consist of lower case alphanumeric characters, - or ., and must start and end with an alphanumeric character.