add integration tests for xattr module (ansible#24947)

* add integration tests for xattr module

* fix whitespace

test/integration/targets/xattr/aliases

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+destructive

test/integration/targets/xattr/defaults/main.yml

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+test_file: ~/foo.txt

test/integration/targets/xattr/tasks/main.yml

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+- name: Setup
+  include: setup.yml
+
+- name: Set attributes
+  xattr:
+    path: "{{ test_file }}"
+    key: user.foo
+    value: bar
+  register: xattr_set_result
+
+- name: Get attributes
+  xattr:
+    path: "{{ test_file }}"
+  register: xattr_get_all_result
+
+- name: Get specific attribute
+  xattr:
+    path: "{{ test_file }}"
+    key: user.foo
+  register: xattr_get_specific_result
+
+- assert:
+    that:
+    - "xattr_set_result.changed"
+    - "xattr_get_all_result['xattr']['user.foo'] == 'bar'"
+    - "not xattr_get_all_result.changed"
+    - "xattr_get_specific_result['xattr']['user.foo'] == 'bar'"
+    - "not xattr_get_specific_result.changed"
+
+- name: Set attribute again
+  xattr:
+    path: "{{ test_file }}"
+    key: user.foo
+    value: bar
+  register: xattr_set_again_result
+
+- assert:
+    that:
+    - "not xattr_set_again_result.changed"
+
+- name: Unset attribute
+  xattr:
+    path: "{{ test_file }}"
+    key: user.foo
+    state: absent
+  register: xattr_unset_result
+
+- name: get attributes
+  xattr:
+    path: "{{ test_file }}"
+  register: xattr_get_after_unset_result
+
+- assert:
+    that:
+    - "xattr_unset_result.changed"
+    - "xattr_get_after_unset_result['xattr'] == {}"
+    - "not xattr_get_after_unset_result.changed"
+
+- name: Unset attribute again
+  xattr:
+    path: "{{ test_file }}"
+    key: user.foo
+    state: absent
+  register: xattr_unset_result
+
+- assert:
+    that:
+    - "not xattr_set_again_result.changed"

test/integration/targets/xattr/tasks/setup.yml

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+- name: Install
+  package:
+    name: attr
+    state: installed
+  become: true
+
+- name: Create file
+  file:
+    path: "{{ test_file }}"
+    state: touch