<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
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##### 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

```

commands = []
        if want.get('name'):
            interface_type = get_interface_type(want['name'])
            interface = 'interface ' + want['name']
        else:
            interface_type = get_interface_type(have['name'])
            interface = 'interface ' + have['name']
        if have.get('description') and want.get('description') != have.get('description'):
            remove_command_from_config_list(interface, 'description', commands)
        if not have.get('enabled') and want.get('enabled') != have.get('enabled'):
            
            remove_command_from_config_list(interface, 'shutdown', commands)
        if interface_type.lower() == 'gigabitethernet':
            if have.get('speed') and have.get('speed') != 'auto' and want.get('speed') != have.get('speed'):
                remove_command_from_config_list(interface, 'speed', commands)
            if have.get('duplex') and have.get('duplex') != 'auto' and want.get('duplex') != have.get('duplex'):
                remove_command_from_config_list(interface, 'duplex', commands)
            if have.get('mtu') and want.get('mtu') != have.get('mtu'):
                remove_command_from_config_list(interface, 'mtu', commands)
        return commands