New automount key management module

There is a new automount key module placed in the plugins folder:

    plugins/modules/ipaautomountkey.py

The server module allows to ensure presence and absence of automount
keys. The module requires an existing automount location and map to
place the key within.

Here is the documentation for the module:

    README-automountkey.md

New example playbooks have been added:

    playbooks/automount/automount-key-absent.yaml
    playbooks/automount/automount-key-present.yaml

New tests for the module:

    tests/automount/test_automountkey.yml

README-automountkey.md

@@ -0,0 +1,104 @@
+Automountkey module
+=====================
+
+Description
+-----------
+
+The automountkey module allows the addition and removal of keys within an automount map. 
+
+It is desgined to follow the IPA api as closely as possible while ensuring ease of use.
+
+
+Features
+--------
+* Automount key management
+
+Supported FreeIPA Versions
+--------------------------
+
+FreeIPA versions 4.4.0 and up are supported by the ipaautomountkey module.
+
+Requirements
+------------
+**Controller**
+* Ansible version: 2.8+
+
+**Node**
+* Supported FreeIPA version (see above)
+
+
+Usage
+=====
+
+Example inventory file
+
+```ini
+[ipaserver]
+ipaserver.test.local
+```
+
+
+Example playbook to ensure presence of an automount map:
+
+```yaml
+---
+- name: Playbook to add an automount map
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  - name: create key TestKey
+    ipaautomountkey:
+      ipaadmin_password: SomeADMINpassword
+      location: TestLocation
+      mapname: TestMap
+      key: TestKey
+      info: 192.168.122.1:/exports
+      state: present
+
+  - name: ensure key TestKey is absent
+    ipaautomountkey:
+      ipaadmin_password: SomeADMINpassword
+      location: TestLocation
+      mapname: TestMap
+      key: TestKey
+      state: absent
+```
+
+Example playbook to rename an automount map:
+
+```yaml
+---
+- name: Playbook to add an automount map
+  - name: ensure key TestKey has been renamed to NewKeyName
+    ipaautomountkey:
+      ipaadmin_password: password01
+      automountlocationcn: TestLocation
+      automountmapname: TestMap
+      automountkey: TestKey
+      newname: NewKeyName
+      state: rename
+```
+
+
+Variables
+=========
+
+ipaautomountkey
+-------
+
+Variable | Description | Required
+-------- | ----------- | --------
+`ipaadmin_principal` | The admin principal is a string and defaults to `admin` | no
+`ipaadmin_password` | The admin password is a string and is required if there is no admin ticket available on the node | no
+`location` \| `automountlocationcn` \| `automountlocation` | Location name. | yes 
+`mapname` \|  `map` \| `automountmapname` \| `automountmap` | Map the key belongs to | yes 
+`key` \| `name` \| `automountkey` | Automount key to manage | yes 
+`newkey` \| newname` \| `newautomountkey` | the name to change the key to if state is `rename` | yes when state is `rename`
+`info` \| `information` \| `automountinformation` | Mount information for the key | yes when state is `present`
+`state` | The state to ensure. It can be one of `present`, or `absent`, default: `present`. | no
+
+Authors
+=======
+
+Chris Procter