New facts module: Memset Memstore (#42387)

* initial commit of facts module to return usage of a Memstore cloudstorage product

* switch API wrapper to use basic auth instead of passing the api_key in the body

* add integration tests (disabled until we have a mock API to test against)

* bump ansible release version to 2.8

test/integration/targets/memset_memstore_facts/aliases

@@ -0,0 +1 @@
+unsupported

test/integration/targets/memset_memstore_facts/meta/main.yml

@@ -0,0 +1 @@
+---

test/integration/targets/memset_memstore_facts/tasks/main.yml

@@ -0,0 +1,27 @@
+---
+- name: query API with invalid API key
+  local_action:
+    module: memset_memstore_facts
+    api_key: 'wa9aerahhie0eekee9iaphoorovooyia'
+    name: 'mstestyaa1'
+  ignore_errors: true
+  register: result
+
+- name: check API response with invalid API key
+  assert:
+    that:
+      - "'Memset API returned a 403 response (ApiErrorForbidden, Bad api_key)' in result.msg"
+      - result is not successful
+
+- name: request memstore facts
+  local_action:
+    module: memset_memstore_facts
+    api_key: "{{ api_key }}"
+    name: 'mstestyaa1'
+  register: result
+
+- name: check the request succeeded
+  assert:
+    that:
+      - result is not changed
+      - result is successful