Adding namespace option into the xattr module (#42755)

* Adding namespace option into the xattr module

* Include namespace into the tests

* Make it backward compatible, remove re and operator module

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

@@ -13,7 +13,7 @@
 - name: Get specific attribute
   xattr:
     path: "{{ test_file }}"
-    key: user.foo
+    key: foo
   register: xattr_get_specific_result
 
 - assert:
@@ -27,7 +27,8 @@
 - name: Set attribute again
   xattr:
     path: "{{ test_file }}"
-    key: user.foo
+    namespace: user
+    key: foo
     value: bar
   register: xattr_set_again_result
 
@@ -38,11 +39,11 @@
 - name: Unset attribute
   xattr:
     path: "{{ test_file }}"
-    key: user.foo
+    key: foo
     state: absent
   register: xattr_unset_result
 
-- name: get attributes
+- name: Get attributes
   xattr:
     path: "{{ test_file }}"
   register: xattr_get_after_unset_result
@@ -56,7 +57,8 @@
 - name: Unset attribute again
   xattr:
     path: "{{ test_file }}"
-    key: user.foo
+    namespace: user
+    key: foo
     state: absent
   register: xattr_unset_result