pwpolicy: Add support for password check and grace limit.

On recent versions of FreeIPA option to verify passwords and for
controlling a password grace period have been added to IPA API.

This patch adds support for the parameters maxrepeat, maxsequence,
dictcheck and usercheck, available since FreeIPA, 4.9 and gracelimit,
available since FreeIPA 4.9.10.

Test playbooks for the module have been updated with the new supported
parameters.

New example playbooks can be found at:

    playbooks/pwpolicy/pwpolicy_grace_limit.yml
    playbooks/pwpolicy/pwpolicy_password_check.yml

playbooks/pwpolicy/pwpolicy_grace_limit.yml

@@ -0,0 +1,11 @@
+---
+- name: Playbook to manage password policy
+  hosts: ipaserver
+  become: no
+  gather_facts: no
+
+  tasks:
+  - name: Set password policy grace limit.
+    ipapwpolicy:
+      ipaadmin_password: SomeADMINpassword
+      gracelimit: 3

playbooks/pwpolicy/pwpolicy_password_check.yml

@@ -0,0 +1,14 @@
+---
+- name: Playbook to manage password policy
+  hosts: ipaserver
+  become: no
+  gather_facts: no
+
+  tasks:
+  - name: Set password checking parameters.
+    ipapwpolicy:
+      ipaadmin_password: SomeADMINpassword
+      maxrepeat: 2
+      maxsequence: 3
+      dictcheck: yes
+      usercheck: yes