New role for ipareplica installation

The support for external cert files is not complete yet.

Please have a look at the example inventory file inventory/hosts.replica and
also the install and uninstall playbook files install-replica.yml and
uninstall-replica.yml

roles/ipareplica/tasks/python_2_3_test.yml

@@ -0,0 +1,19 @@
+- block:
+  - name: Verify Python3 import
+    script: py3test.py
+    register: py3test
+    failed_when: False
+
+  - name: Set python interpreter to 3
+    set_fact:
+      ansible_python_interpreter: "/usr/bin/python3"
+    when: py3test.rc == 0
+
+  - name: Fail for IPA 4.5.90
+    fail: msg="You need to install python2 bindings for ipa server usage"
+    when: py3test.rc != 0 and "not usable with python3" in py3test.stdout
+
+  - name: Set python interpreter to 2
+    set_fact:
+      ansible_python_interpreter: "/usr/bin/python2"
+    when: py3test.failed or py3test.rc != 0