xenserver: remove required=false from arg spec (#10769)

* xenserver: remove required=false from arg spec

* add changelog frag

changelogs/fragments/10769-xenserver-rf.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - xenserver module utils - remove redundant constructs from argument specs (https://github.com/ansible-collections/community.general/pull/10769).

plugins/module_utils/xenserver.py

@@ -28,22 +28,18 @@ def xenserver_common_argument_spec():
     return dict(
         hostname=dict(type='str',
                       aliases=['host', 'pool'],
-                      required=False,
                       default='localhost',
                       fallback=(env_fallback, ['XENSERVER_HOST']),
                       ),
         username=dict(type='str',
                       aliases=['user', 'admin'],
-                      required=False,
                       default='root',
                       fallback=(env_fallback, ['XENSERVER_USER'])),
         password=dict(type='str',
                       aliases=['pass', 'pwd'],
-                      required=False,
                       no_log=True,
                       fallback=(env_fallback, ['XENSERVER_PASSWORD'])),
         validate_certs=dict(type='bool',
-                            required=False,
                             default=True,
                             fallback=(env_fallback, ['XENSERVER_VALIDATE_CERTS'])),
     )