Update boot-server ansible role for el10
# CentOS Infra issue/request
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## Issue Type
* [] Issue - problem with something that was working
* [x] Feature Request - something you'd like us to add/modify/change
* [] Task - mostly used by CentOS Infra team for day-to-day operations or bigger plans
## Description
Our current boot-server ansible role can take care of :
- dhcpd
- tftpd
But since CentOS Stream 10/RHEL10, ISC dhcpd is now gone so role has to be adapted to its successor : [KEA](https://www.isc.org/kea/)
This task is about upgrading the ansible role to cover this and also test that it works so that we can then migrate our boot-servers/dhcpd instances to el10 at some point (to be done for Stream DC move)
issue