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##### SUMMARY
I want to be able to use a pure (non-regex) line with lineinfile. Without accidentally escaping or not escaping characters.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
lineinfile

##### ADDITIONAL INFORMATION

I have a line in a file which has lots of special characters. I want to use Ansible's lineinfile module.

Ansible's lineinfile module requires a regular expression, which means lots of escaping for me, and a role or playbook that is more difficult to read.

Could the module support a non-regex line too?

Example of problem regex (have fun escaping this one! - real world example):

```yaml
    lineinfile:
      path: /etc/apt/apt.conf.d/50unattended-upgrades
      regexp: '#         "${distro_id}:${distro_codename}-updates";'
      line: '         "${distro_id}:${distro_codename}-updates";'
```
b_dest = to_bytes(dest, errors='surrogate_or_strict')
    if not os.path.exists(b_dest):
        module.exit_json(changed=False, msg="file not present")
    msg = ''
    diff = {'before': '',
            'after': '',
            'before_header': '%s (content)' % dest,
            'after_header': '%s (content)' % dest}
    with open(b_dest, 'rb') as f:
        b_lines = f.readlines()
    if module._diff:
        diff['before'] = to_native(b''.join(b_lines))
    if regexp is not None:
        bre_c = re.compile(to_bytes(regexp, errors='surrogate_or_strict'))
    found = []
    b_line = to_bytes(line, errors='surrogate_or_strict')
    def matcher(b_cur_line):