Drop support for ansible-core 2.15; update CI to move ansible-core 2.16 to EOL CI; remove compat code for ansible-core < 2.14 (#10160)

* Drop support for ansible-core 2.15. Move 2.16 to EOL CI.

* Remove compatibility code for older ansible-core versions.

* Remove commented out parts.

plugins/module_utils/redfish_utils.py

@@ -10,9 +10,7 @@ import json
 import os
 import random
 import string
-import gzip
 import time
-from io import BytesIO
 from ansible.module_utils.urls import open_url
 from ansible.module_utils.common.text.converters import to_native
 from ansible.module_utils.common.text.converters import to_text
@@ -21,8 +19,6 @@ from ansible.module_utils.six import text_type
 from ansible.module_utils.six.moves import http_client
 from ansible.module_utils.six.moves.urllib.error import URLError, HTTPError
 from ansible.module_utils.six.moves.urllib.parse import urlparse
-from ansible.module_utils.ansible_release import __version__ as ansible_version
-from ansible_collections.community.general.plugins.module_utils.version import LooseVersion
 
 GET_HEADERS = {'accept': 'application/json', 'OData-Version': '4.0'}
 POST_HEADERS = {'content-type': 'application/json', 'accept': 'application/json',
@@ -183,12 +179,7 @@ class RedfishUtils(object):
                 timeout=timeout,
             )
             try:
-                if headers.get('content-encoding') == 'gzip' and LooseVersion(ansible_version) < LooseVersion('2.14'):
-                    # Older versions of Ansible do not automatically decompress the data
-                    # Starting in 2.14, open_url will decompress the response data by default
-                    data = json.loads(to_native(gzip.open(BytesIO(resp.read()), 'rt', encoding='utf-8').read()))
-                else:
-                    data = json.loads(to_native(resp.read()))
+                data = json.loads(to_native(resp.read()))
             except Exception as e:
                 # No response data; this is okay in certain cases
                 data = None