Fix integration test error on ansible devel branch

- Remove centos6 platforms for integration tests on
  the ansible devel branch from the azure-pipelines.
- Add delegate_to to each task of integration test for
  synchronized module on devel branch
- Modify invalid parameter test to use key instead of name
  for sysctl module
- Replace lookup plugin to slurp module in integration tests
  for selinux module
- Add creating working directory task in integration tests
  for acl module

Signed-off-by: Hideki Saito <saito@fgrep.org>

tests/integration/targets/selinux/tasks/selinux.yml

@@ -26,10 +26,19 @@
     state: present
 
 - name: TEST 1 | Get current SELinux config file contents
+  slurp:
+    src: /etc/sysconfig/selinux
+  register: selinux_config_original_base64
+
+- name: TEST 1 | Register SELinux config and SELinux status
   set_fact:
-    selinux_config_original: "{{ lookup('file', '/etc/sysconfig/selinux').split('\n') }}"
+    selinux_config_original_raw: "{{ selinux_config_original_base64.content | b64decode }}"
     before_test_sestatus: "{{ ansible_selinux }}"
 
+- name: TEST 1 | Split by line and register original config
+  set_fact:
+    selinux_config_original: "{{ selinux_config_original_raw.split('\n') }}"
+
 - debug:
     var: "{{ item }}"
     verbosity: 1
@@ -95,8 +104,17 @@
       - _disable_test2.reboot_required
 
 - name: TEST 1 | Get modified config file
+  slurp:
+    src: /etc/sysconfig/selinux
+  register: selinux_config_after_base64
+
+- name: TEST 1 | Register modified config
   set_fact:
-    selinux_config_after: "{{ lookup('file', '/etc/sysconfig/selinux').split('\n') }}"
+    selinux_config_after_raw: "{{ selinux_config_after_base64.content | b64decode }}"
+
+- name: TEST 1 | Split by line and register modified config
+  set_fact:
+    selinux_config_after: "{{ selinux_config_after_raw.split('\n') }}"
 
 - debug:
     var: selinux_config_after
@@ -209,8 +227,17 @@
       - not _state_test2.reboot_required
 
 - name: TEST 2 | Get modified config file
+  slurp:
+    src: /etc/sysconfig/selinux
+  register: selinux_config_after_base64
+
+- name: TEST 2 | Register modified config
   set_fact:
-    selinux_config_after: "{{ lookup('file', '/etc/sysconfig/selinux').split('\n') }}"
+    selinux_config_after_raw: "{{ selinux_config_after_base64.content | b64decode }}"
+
+- name: TEST 2 | Split by line and register modified config
+  set_fact:
+    selinux_config_after: "{{ selinux_config_after_raw.split('\n') }}"
 
 - debug:
     var: selinux_config_after