Document packages for adm hosts and add nsd for dns zone validation

playbooks/adm.yml

@@ -39,13 +39,14 @@
         name: "{{ item }}"
         state: installed
       with_items:
-        - python3-flake8
-        - libvirt-client
-        - make
-        - pylint
-        - virt-install
-        - whois
-        - yamllint
+        - python3-flake8      # python linting
+        - libvirt-client      # kvm host client
+        - make                # generic building
+        - nsd                 # check dns zone files
+        - pylint              # python linting
+        - virt-install        # install kvm guests
+        - whois               # read whois data
+        - yamllint            # yaml linting
     - name: disable ip host key checking from ssh
       copy:
         content: |