New selfservice management module

There is a new selfservice management module placed in the plugins folder:

    plugins/modules/ipaselfservice.py

The selfservice module allows to ensure presence and absence of selfservices
and manage selfservice attributes.

Here is the documentation for the module:

    README-selfservice.md

New example playbooks have been added:

    playbooks/selfservice/selfservice-absent.yml
    playbooks/selfservice/selfservice-present.yml
    playbooks/selfservice/selfservice-member-absent.yml
    playbooks/selfservice/selfservice-member-present.yml

New tests for the module:

    tests/selfservice/test_selfservice.yml

README-selfservice.md

@@ -0,0 +1,151 @@
+Selfservice module
+=================
+
+Description
+-----------
+
+The selfservice module allows to ensure presence, absence of selfservices and selfservice attributes.
+
+
+Features
+--------
+
+* Selfservice management
+
+
+Supported FreeIPA Versions
+--------------------------
+
+FreeIPA versions 4.4.0 and up are supported by the ipaselfservice 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 make sure selfservice "Users can manage their own name details" is present:
+
+```yaml
+---
+- name: Playbook to manage IPA selfservice.
+  hosts: ipaserver
+  become: yes
+
+  tasks:
+  - ipaselfservice:
+      ipaadmin_password: SomeADMINpassword
+      name: "Users can manage their own name details"
+      permission: read
+      attribute:
+      - title
+      - initials
+```
+
+
+Example playbook to make sure selfservice "Users can manage their own name details" is absent:
+
+```yaml
+---
+- name: Playbook to manage IPA selfservice.
+  hosts: ipaserver
+  become: yes
+
+  tasks:
+  - ipaselfservice:
+      ipaadmin_password: SomeADMINpassword
+      name: "Users can manage their own name details"
+      state: absent
+```
+
+
+Example playbook to make sure "Users can manage their own name details" member attribute initials is present:
+
+```yaml
+---
+- name: Playbook to manage IPA selfservice.
+  hosts: ipaserver
+  become: yes
+
+  tasks:
+  - ipaselfservice:
+      ipaadmin_password: SomeADMINpassword
+      name: "Users can manage their own name details"
+      attribute:
+      - initials
+      action: member
+```
+
+
+Example playbook to make sure "Users can manage their own name details" member attribute initials is absent:
+
+```yaml
+---
+- name: Playbook to manage IPA selfservice.
+  hosts: ipaserver
+  become: yes
+
+  tasks:
+  - ipaselfservice:
+      ipaadmin_password: SomeADMINpassword
+      name: "Users can manage their own name details"
+      attribute:
+      - initials
+      action: member
+      state: absent
+```
+
+
+Example playbook to make sure selfservice "Users can manage their own name details" is absent:
+
+```yaml
+---
+- name: Playbook to manage IPA selfservice.
+  hosts: ipaserver
+  become: yes
+
+  tasks:
+  - ipaselfservice:
+      ipaadmin_password: SomeADMINpassword
+      name: "Users can manage their own name details"
+      state: absent
+```
+
+
+Variables
+---------
+
+ipaselfservice
+-------
+
+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
+`name` \| `aciname` | The list of selfservice name strings. | yes
+`permission` \| `permissions` |  The permission to grant `read`, `read,write`, `write`]. Default is `write`. | no
+`attribute` \| `attrs` | The attribute list to which the selfservice applies. | no
+`action` | Work on selfservice or member level. It can be on of `member` or `selfservice` and defaults to `selfservice`. | no
+`state` | The state to ensure. It can be one of `present`, `absent`, default: `present`. | no
+
+
+Authors
+=======
+
+Thomas Woerner