New idp management module

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

    plugins/modules/ipaidp.py

The idp module allows to ensure presence or absence of external Identity
Providers.

Here is the documentation for the module:

    README-idp.md

New idp example playbooks:

    playbooks/idp/idp-present.yml
    playbooks/idp/idp-absent.yml

New tests for the module:

    tests/idp/test_idp.yml
    tests/idp/test_idp_client_context.yml

playbooks/idp/idp-absent.yml

@@ -0,0 +1,11 @@
+---
+- name: Idp absent example
+  hosts: ipaserver
+  become: no
+
+  tasks:
+  - name: Ensure github idp my-github-idp is absent
+    ipaidp:
+      ipaadmin_password: SomeADMINpassword
+      name: my-github-idp
+      state: absent

playbooks/idp/idp-present.yml

@@ -0,0 +1,12 @@
+---
+- name: Idp present example
+  hosts: ipaserver
+  become: no
+
+  tasks:
+  - name: Ensure github idp my-github-idp is present
+    ipaidp:
+      ipaadmin_password: SomeADMINpassword
+      name: my-github-idp
+      provider: github
+      client_id: my-github-client-id