<!--- Verify first that your feature was not already discussed on GitHub -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
The ios_banner currently strips any text passed to it, making certain banner formats impossible to replicate properly.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ios_banner

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
Add a boolean switch to the module params (`strip`, perhaps) that would conditionally strip or not the text passed from the param. Could be optional and default to `True`.

<!--- Paste example playbooks or commands between quotes below -->
```yaml
ios_banner:
  strip: no
  banner: login
  present: yes
  text: "{{ lookup('template', 'banner.j2') }}"
```
with the `banner.j2` looking like
```
            WARNING
This is a private system if you
do not belong here, bugger off
or something.
```
<!--- HINT: You can also paste gist.github.com links for larger files -->

rc, out, err = exec_command(module, 'show banner %s' % module.params['banner'])
    if rc == 0:
        output = out
    else:
        rc, out, err = exec_command(module,
                                    'show running-config | begin banner %s'
                                    % module.params['banner'])
        if out:
            output = re.search(r'\^C(.*?)\^C', out, re.S).group(1).strip()
        else:
            output = None
    obj = {'banner': module.params['banner'], 'state': 'absent'}
    if output:
        obj['text'] = output
        obj['state'] = 'present'
    return obj
def map_params_to_obj(module):
    text = module.params['text']
    if text:
        text = str(text).strip()
    return {
        'banner': module.params['banner'],
        'text': text,
        'state': module.params['state']
    }
def main():