New module for managing EMC VNX Block storage (#42945)

* New module for managing EMC VNX Block storage

With the module emc_vnx_sg_member users can add or remove luns from
existing storage groups.

This module has been developed in couple with emc_vnx_mv_promote for
disaster recovery process automation, but can be used by itself.

lib/ansible/utils/module_docs_fragments/emc.py

@@ -0,0 +1,43 @@
+#
+# Copyright (c) 2018, Luca 'remix_tj' Lorenzetto <lorenzetto.luca@gmail.com>
+#
+# This file is part of Ansible
+#
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+
+class ModuleDocFragment(object):
+
+    DOCUMENTATION = """
+options:
+  - See respective platform section for more details
+requirements:
+  - See respective platform section for more details
+notes:
+  - Ansible modules are available for EMC VNX.
+"""
+
+    # Documentation fragment for VNX (emc_vnx)
+    EMC_VNX = """
+options:
+    sp_address:
+        description:
+            - Address of the SP of target/secondary storage.
+        required: true
+    sp_user:
+        description:
+            - Username for accessing SP.
+        default: sysadmin
+        required: false
+    sp_password:
+        description:
+            - password for accessing SP.
+        default: sysadmin
+        required: false
+requirements:
+  - An EMC VNX Storage device.
+  - Ansible 2.7.
+  - storops (0.5.10 or greater). Install using 'pip install storops'.
+notes:
+  - The modules prefixed with emc_vnx are built to support the ONTAP storage platform.
+    """