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##### SUMMARY
Add comment_start_string and comment_end_string to template plugin.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
template

##### ADDITIONAL INFORMATION
In some situation, we need to change comment behavior of template plugin, for an example macros in Zabbix is like {#MACRO}.

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: Render a template with "comment_start_string" set to [#
  template:
    src: template.xml.j2
    dest: template.xml
    comment_start_string: "[#"
    comment_end_string: "#]"
```

<!--- HINT: You can also paste gist.github.com links for larger files -->

newsearchpath = []
                    for p in searchpath:
                        newsearchpath.append(os.path.join(p, 'templates'))
                        newsearchpath.append(p)
                    searchpath = newsearchpath
                searchpath.insert(0, os.path.dirname(lookupfile))
                
                
                
                
                vars = deepcopy(variables)
                vars.update(generate_ansible_template_vars(term, lookupfile))
                vars.update(lookup_template_vars)
                with templar.set_temporary_context(variable_start_string=variable_start_string,
                                                   variable_end_string=variable_end_string,
                                                   available_variables=vars, searchpath=searchpath):
                    res = templar.template(template_data, preserve_trailing_newlines=True,
                                           convert_data=convert_data_p, escape_backslashes=False)
                if USE_JINJA2_NATIVE and not jinja2_native:
                    
                    
                    res = NativeJinjaText(res)
                ret.append(res)
            else:
                raise AnsibleError("the template file %s could not be found for the lookup" % term)
        return ret