updates ios modules to support persistent socket (#21258)

* updates all ios modules to support persistent socket
* adds ios action plugin to connect to device
* adds exec_command() to ios shared module
* fixes ios_config and ios_template local action
* update all unit test cases
* adds base test module for ios module testing

lib/ansible/modules/network/ios/ios_facts.py

@@ -33,7 +33,6 @@ description:
     base network fact keys with C(ansible_net_<fact>).  The facts
     module will always collect a base set of facts from the device
     and can enable or disable collection of additional facts.
-extends_documentation_fragment: ios
 options:
   gather_subset:
     description:
@@ -143,33 +142,12 @@ ansible_net_neighbors:
 """
 import re
 
-from functools import partial
-
-from ansible.module_utils import ios
-from ansible.module_utils import ios_cli
+from ansible.module_utils.ios import run_commands
+from ansible.module_utils.ios import ios_argument_spec, check_args
 from ansible.module_utils.basic import AnsibleModule
-from ansible.module_utils.local import LocalAnsibleModule
 from ansible.module_utils.six import iteritems
 from ansible.module_utils.six.moves import zip
 
-SHARED_LIB = 'ios'
-
-def get_ansible_module():
-    if SHARED_LIB == 'ios':
-        return LocalAnsibleModule
-    return AnsibleModule
-
-def invoke(name, *args, **kwargs):
-    obj = globals().get(SHARED_LIB)
-    func = getattr(obj, name)
-    return func(*args, **kwargs)
-
-run_commands = partial(invoke, 'run_commands')
-
-def check_args(module, warnings):
-    if SHARED_LIB == 'ios_cli':
-        ios_cli.check_args(module)
-
 
 class FactsBase(object):
 
@@ -443,13 +421,10 @@ def main():
         gather_subset=dict(default=['!config'], type='list')
     )
 
-    argument_spec.update(ios_cli.ios_cli_argument_spec)
+    argument_spec.update(ios_argument_spec)
 
-    cls = get_ansible_module()
-    module = cls(argument_spec=argument_spec, supports_check_mode=True)
-
-    warnings = list()
-    check_args(module, warnings)
+    module = AnsibleModule(argument_spec=argument_spec,
+                           supports_check_mode=True)
 
     gather_subset = module.params['gather_subset']
 
@@ -500,9 +475,11 @@ def main():
         key = 'ansible_net_%s' % key
         ansible_facts[key] = value
 
-    module.exit_json(ansible_facts=ansible_facts)
+    warnings = list()
+    check_args(module, warnings)
+
+    module.exit_json(ansible_facts=ansible_facts, warnings=warnings)
 
 
 if __name__ == '__main__':
-    SHARED_LIB = 'ios_cli'
     main()