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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

```

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##### 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

```

---
module: ios_interfaces
version_added: 2.9
short_description: Manages interface attributes of Cisco IOS network devices
description: This module manages the interface attributes of Cisco IOS network devices.
author: Sumit Jaiswal (@justjais)
notes:
- Tested against Cisco IOSv Version 15.2 on VIRL
options:
  config:
    description: A dictionary of interface options
    type: list
    suboptions:
      name:
        description:
        - Full name of interface, e.g. GigabitEthernet0/2, loopback999.
        type: str
        required: True
      description:
        description:
        - Interface description.
        type: str
      enabled:
        description:
        - Administrative state of the interface.
        - Set the value to C(true) to administratively enable the interface or C(false) to disable it.
        type: bool
        default: True
      speed:
        description: