Removed 'partial_line_waiting'.

While not the default templates, this adds basic support for filebeat v5
as long as the correct `conf_template` parameter is passed.

If this value is a string filebeat will not start

```
Loading config file error: YAML config parsing failed on /etc/filebeat/filebeat.yml: yaml: unmarshal errors:
  line 11: cannot unmarshal !!str `120` into int. Exiting.
```

Output logstash timeout value should be an integer.

* New major_version parameter
* Install v5 by default if nothing is already there (and not
  overridden by major_version)
* If v1 is installed, continue to manage it unless major_version is
  set to 5.
* Test all 3 cases

Fixes #43
Fixes #44

…n file