<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Explain the problem briefly below -->
Unit tests for ios_interfaces is failing, with import error

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ios_interfaces
##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
devel
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
macos

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
Unit tests for `ios_interfaces` should pass w/o any issue/failure

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
Unit tests are failing with error: `ImportError: cannot import name 'dict_diff' from 'ansible.module_utils.network.ios.utils.utils'`
<!--- Paste verbatim command output between quotes -->
```paste below

```

test_dict = {}
    for k, v in iteritems(sample_dict):
        if v is not None:
            test_dict.update({k: v})
    return_set = set(tuple(test_dict.items()))
    return return_set
def filter_dict_having_none_value(want, have):
    
    test_dict = dict()
    test_dict['name'] = want.get('name')
    for k, v in iteritems(want):
        if v is None:
            val = have.get(k)
            test_dict.update({k: val})
    return test_dict
def remove_duplicate_interface(commands):
    
    set_cmd = []
    for each in commands:
        if 'interface' in each:
            if each not in set_cmd:
                set_cmd.append(each)
        else:
            set_cmd.append(each)
    return set_cmd
def search_obj_in_list(name, lst):