New user management module

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

  plugins/modules/ipauser.py

The user module allows to add, remove, enable, disable, unlock und undelete
users.

The user module is as compatible as possible to the Ansible upstream
`ipa_user` module, but addtionally offers to preserve delete, enable,
disable, unlock and undelete users.

Here is the documentation for the module:

  README-user.md

New example playbooks have been added:

  playbooks/user/add-user.yml
  playbooks/user/delete-user.yml
  playbooks/user/enable-user.yml
  playbooks/user/disable-user.yml
  playbooks/user/delete-preserve--user.yml
  playbooks/user/undelete-user.yml

README-user.md

@@ -0,0 +1,197 @@
+User module
+===========
+
+Description
+-----------
+
+The user module allows to add, remove, enable, disable, unlock und undelete users.
+
+The user module is as compatible as possible to the Ansible upstream `ipa_user` module, but addtionally offers to preserve delete, enable, disable, unlock and undelete users.
+
+
+Features
+--------
+* User management
+
+
+Supported FreeIPA Versions
+--------------------------
+
+FreeIPA versions 4.4.0 and up are supported by the ipauser 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 add users:
+
+```yaml
+---
+- name: Playbook to handle users
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Create user pinky
+  - ipauser:
+      ipaadmin_password: MyPassword123
+      name: pinky
+      first: pinky
+      last: Acme
+      uid: 10001
+      gid: 100
+      phone: "+555123457"
+      email: pinky@acme.com
+      passwordexpiration: "2023-01-19 23:59:59"
+      password: "no-brain"
+      update_password: on_create
+
+  # Create user brain
+  - ipauser:
+      ipaadmin_password: MyPassword123
+      name: brain
+      first: brain
+      last: Acme
+```
+`update_password` controls if a password for a user will be set in present state only on creation or every time (always).
+
+
+Example playbook to delete a user, but preserve it:
+
+```yaml
+---
+- name: Playbook to handle users
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Remove user pinky and brain
+  - ipauser:
+      ipaadmin_password: MyPassword123
+      name: pinky
+      preserve: yes
+      state: disabled
+```
+
+
+Example playbook to undelete a user.
+
+```yaml
+---
+- name: Playbook to handle users
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Remove user pinky and brain
+  - ipauser:
+      ipaadmin_password: MyPassword123
+      name: pinky
+      state: undeleted
+```
+
+
+Example playbook to disable a user:
+
+```yaml
+---
+- name: Playbook to handle users
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Remove user pinky and brain
+  - ipauser:
+      ipaadmin_password: MyPassword123
+      name: pinky
+      state: disabled
+```
+
+
+Example playbook to enable a users:
+
+```yaml
+---
+- name: Playbook to handle users
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Remove user pinky and brain
+  - ipauser:
+      ipaadmin_password: MyPassword123
+      name: pinky,brain
+      state: disabled
+```
+
+
+Example playbook to delete users:
+
+```yaml
+---
+- name: Playbook to handle users
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Remove user pinky and brain
+  - ipauser:
+      ipaadmin_password: MyPassword123
+      name: pinky,brain
+      state: disabled
+```
+
+
+Variables
+=========
+
+ipauser
+-------
+
+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` | The list of user name strings. | no
+`first` \| ¸givenname` | The first name string. | no
+`last` | The last name | no
+`fullname` \| `cn` | The full name string. | no
+`displayname` | The display name string. | no
+`homedir` | The home directory string. | no
+`shell` \| `loginshell` | The login shell string. | no
+`email` | List of email address strings. | no
+`principalname` \| `krbprincipalname` | The kerberos principal sptring. | no
+`passwordexpiration` \| `krbpasswordexpiration` | The kerberos password expiration date. Possible formats: `YYYYMMddHHmmssZ`, `YYYY-MM-ddTHH:mm:ssZ`, `YYYY-MM-ddTHH:mmZ`, `YYYY-MM-ddZ`, `YYYY-MM-dd HH:mm:ssZ` or `YYYY-MM-dd HH:mmZ`. The trailing 'Z' can be skipped. | no
+`password` | The user password string. | no
+`uid` \| `uidnumber` | The UID integer. | no
+`gid` \| `gidnumber` | The GID integer. | no
+`phone` \| `telephonenumber` | List of telephone number strings, | no
+`title` | The job title string. | no
+~~`sshpubkey` \| `ipasshpubkey`~~ | ~~List of SSH public keys.~~ | ~~no~~
+`update_password` | Set password for a user in present state only on creation or always. It can be one of `always` or `on_create` and defaults to `always`. | no
+`preserve` | Delete a user, keeping the entry available for future use. (bool)  | no
+`state` | The state to ensure. It can be one of `present`, `absent`, `enabled`, `disabled`, `unlocked` or `undeleted`, default: `present`. | yes
+
+
+Authors
+=======
+
+Thomas Woerner