Fix invalid src option return response for network config modules

[ganeshrn]

SUMMARY

• Add changed key in a failure case to maintain backward compatibility

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

ios_config
junos_config
eos_config
iosxr_config

ADDITIONAL INFORMATION

Network integration test failures

test/integration/targets/junos_config/tests/netconf/src_invalid.yaml:13
Task

  - name: configure with invalid src
    junos_config:
      src: basic/foobar.j2
      #provider: "{{ netconf }}"
    register: result
    ignore_errors: yes
  
- assert:
      that:
        - "result.changed == false"
        - "result.failed == true"
        - "result.msg == 'path specified in src not found'"

Before

{
"msg": "The conditional check 'result.changed == false' failed. The error was: error while evaluating conditional (result.changed == false): 'dict object' has no attribute 'changed'"
}

After:

ok: [junos01] => {
    "changed": false,
    "msg": "All assertions passed"
}

[ansibot]

cc @NilashishC @Qalthos @gdpak @justjais @rcarrillocruz @trishnaguha
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