ipasudorule: Add support for batch mode and multiple sudorules

Currently, ipasudorule must add or modify a single sudorule at a time,
incurring in more load in the server if there are many rules to be
processed.

This patch adds suport for adding multiple sudorules in one playbook
task by using the parameter 'sudorules' and defining a list of sudorules
configurations to be ensured.

As multiple sudorules will be processed, the patch also enables batch
mode processing of sudorules, trying to reduce the load on the server.

Test 'tests/sudorule/test_sudorule_client_context.yml' was modified to
include tasks with 'sudorules' to be executed both on the server or on
the client context.

New tests were added to the sudorule test suite:

    tests/sudorule/test_sudorules.yml
    tests/sudorule/test_sudorules_member_case_insensitive.yml

README-sudorule.md

@@ -129,6 +129,24 @@ Example playbook to make sure Sudo Rule is absent:
       state: absent
 ```
 
+Example playbook to ensure multiple Sudo Rule are present using batch mode:
+
+```yaml
+---
+- name: Playbook to handle sudorules
+  hosts: ipaserver
+  become: true
+
+- name: Ensure multiple Sudo Rules are present using batch mode.
+  ipasudorule:
+    ipaadmin_password: SomeADMINpassword
+    sudorules:
+      - name: testrule1
+        hostmask:
+          - 192.168.122.1/24
+      - name: testrule2
+        hostcategory: all
+```
 
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