network command modules cleanup (#45242)

* Standardize _command modules

* Centralize command transformation process

* Fix check mode error test

lib/ansible/module_utils/network/common/utils.py

@@ -34,6 +34,7 @@ from itertools import chain
 from struct import pack
 from socket import inet_aton, inet_ntoa
 
+from ansible.module_utils._text import to_text
 from ansible.module_utils.six import iteritems, string_types
 from ansible.module_utils.six.moves import zip
 from ansible.module_utils.basic import AnsibleFallbackNotFound
@@ -60,6 +61,26 @@ def to_list(val):
         return list()
 
 
+def to_lines(stdout):
+    for item in stdout:
+        if isinstance(item, string_types):
+            item = to_text(item).split('\n')
+        yield item
+
+
+def transform_commands(module):
+    transform = ComplexList(dict(
+        command=dict(key=True),
+        output=dict(),
+        prompt=dict(type='list'),
+        answer=dict(type='list'),
+        sendonly=dict(type='bool', default=False),
+        check_all=dict(type='bool', default=False),
+    ), module)
+
+    return transform(module.params['commands'])
+
+
 def sort_list(val):
     if isinstance(val, list):
         return sorted(val)