corrected default inventory plugin order

default inventory plugin order now follows the hardcoded one in previous versions
yaml plugin shoudl run before ini to avoid ini being able to parse some yaml files succesfully.

fixes ansible#25321

Author: bcoca

examples/ansible.cfg

@@ -72,7 +72,7 @@
 # enable callback plugins, they can output to stdout but cannot be 'stdout' type.
 #callback_whitelist = timer, mail
 
-# enable inventory plugins, default: 'host_list', 'script', 'ini', 'yaml'
+# enable inventory plugins, default: 'host_list', 'script', 'yaml', 'ini'
 #inventory_enabled = host_list, aws, openstack, docker
 
 # Determine whether includes in tasks and handlers are "static" by

lib/ansible/constants.py

@@ -242,7 +242,7 @@ def load_config_file():
 # Inventory
 DEFAULT_HOST_LIST = get_config(p, DEFAULTS, 'inventory', 'ANSIBLE_INVENTORY', '/etc/ansible/hosts', value_type='path', expand_relative_paths=True)
 INVENTORY_ENABLED = get_config(p, DEFAULTS, 'inventory_enabled', 'ANSIBLE_INVENTORY_ENABLED',
-                               ['host_list', 'script', 'ini', 'yaml'], value_type='list')
+                               ['host_list', 'script', 'yaml', 'ini'], value_type='list')
 INVENTORY_IGNORE_EXTS = get_config(p, DEFAULTS, 'inventory_ignore_extensions', 'ANSIBLE_INVENTORY_IGNORE',
                                    BLACKLIST_EXTS + (".orig", ".ini", ".cfg", ".retry"), value_type='list')
 INVENTORY_IGNORE_PATTERNS = get_config(p, DEFAULTS, 'inventory_ignore_patterns', 'ANSIBLE_INVENTORY_IGNORE_REGEX', [], value_type='list')