Add proxmox_node_info module (#7689)

* Add proxmox_node_info module - restarted PR due to erroneous update/push of my local fork.

* Used wrong user ID.

* Changes requested by felixfontein:
- Capitalization and punctuation in documentation section
- trailing comma on line 125
- Re-order BOTMETA so it is alphabetical

* Mis-copied older version of code, correcting actual call

* Add tests for proxmox_node_info module

tests/integration/targets/proxmox/tasks/main.yml

@@ -577,3 +577,20 @@
         - results_kvm_destroy is changed
         - results_kvm_destroy.vmid == {{ vmid }}
         - results_kvm_destroy.msg == "VM {{ vmid }} removed"
+
+- name: Retrieve information about nodes
+  proxmox_node_info:
+    api_host: "{{ api_host }}"
+    api_user: "{{ user }}@{{ domain }}"
+    api_password: "{{ api_password | default(omit) }}"
+    api_token_id: "{{ api_token_id | default(omit) }}"
+    api_token_secret: "{{ api_token_secret | default(omit) }}"
+    validate_certs: "{{ validate_certs }}"
+  register: results
+
+- assert:
+    that:
+    - results is not changed
+    - results.proxmox_nodes is defined
+    - results.proxmox_nodes|length >= 1
+    - results.proxmox_nodes[0].type == 'node'