<!--- 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 -->

#
#
#
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
from units.compat.mock import patch
from ansible.modules.network.ios import ios_banner
from units.modules.utils import set_module_args
from .ios_module import TestIosModule, load_fixture
class TestIosBannerModule(TestIosModule):
    module = ios_banner
    def setUp(self):
        super(TestIosBannerModule, self).setUp()
        self.mock_exec_command = patch('ansible.modules.network.ios.ios_banner.exec_command')
        self.exec_command = self.mock_exec_command.start()
        self.mock_load_config = patch('ansible.modules.network.ios.ios_banner.load_config')
        self.load_config = self.mock_load_config.start()
    def tearDown(self):
        super(TestIosBannerModule, self).tearDown()
        self.mock_exec_command.stop()
        self.mock_load_config.stop()
    def load_fixtures(self, commands=None):