Add enable become plugin patterned after runas (#52496)

lib/ansible/plugins/become/enable.py

@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+# Copyright: (c) 2018, Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+DOCUMENTATION = """
+    become: enable
+    short_description: Switch to elevated permissions on a network device
+    description:
+        - This become plugins allows elevated permissions on a remote network device.
+    author: ansible (@core)
+    version_added: "2.8"
+    options:
+        become_pass:
+            description: password
+            ini:
+              - section: enable_become_plugin
+                key: password
+            vars:
+              - name: ansible_become_password
+              - name: ansible_become_pass
+              - name: ansible_enable_pass
+            env:
+              - name: ANSIBLE_BECOME_PASS
+              - name: ANSIBLE_ENABLE_PASS
+    notes:
+        - enable is really implemented in the network connection handler and as such can only be used with network connections.
+        - This plugin ignores the 'become_exe' and 'become_user' settings as it uses an API and not an executable.
+"""
+
+from ansible.plugins.become import BecomeBase
+
+
+class BecomeModule(BecomeBase):
+
+    name = 'enable'
+
+    def build_become_command(self, cmd, shell):
+        # enable is implemented inside the network connection plugins
+        return cmd