ansible-ipa-*-install: Use /usr/bin/python by default, fix _install_packages

/usr/bin/python should be used by default. Fixed typo in _install_packages
setting in the inventory file.

utils/ansible-ipa-client-install

-#!/usr/bin/python3
+#!/usr/bin/python
 # -*- coding: utf-8 -*-
 
 # Authors:
@@ -330,7 +330,7 @@ def main(options, args):
             f.write("ipaclient_allow_repair=%s\n" %
                     options.ipaclient_allow_repair)
         if options.ipaclient_install_packages:
-            f.write("ipaclient_install-packages=%s\n" %
+            f.write("ipaclient_install_packages=%s\n" %
                     options.ipaclient_install_packages)
 
     if options.uninstall:

utils/ansible-ipa-replica-install

-#!/usr/bin/python3
+#!/usr/bin/python
 # -*- coding: utf-8 -*-
 
 # Authors:
@@ -445,7 +445,7 @@ def main(options, args):
                     options.secondary_rid_base)
         # ansible
         if options.ipareplica_install_packages:
-            f.write("ipareplica_install-packages=%s\n" %
+            f.write("ipareplica_install_packages=%s\n" %
                     options.ipareplica_install_packages)
         if options.ipareplica_setup_firewalld:
             f.write("ipareplica_setup_firewalld=%s\n" %

utils/ansible-ipa-server-install

-#!/usr/bin/python3
+#!/usr/bin/python
 # -*- coding: utf-8 -*-
 
 # Authors:
@@ -493,7 +493,7 @@ def main(options, args):
             f.write("ipaserver_ignore_last_of_role=yes\n")
         # ansible
         if options.ipaserver_install_packages:
-            f.write("ipaserver_install-packages=%s\n" %
+            f.write("ipaserver_install_packages=%s\n" %
                     options.ipaserver_install_packages)
         if options.ipaserver_setup_firewalld:
             f.write("ipaserver_setup_firewalld=%s\n" %