Fix line wrapping in sidecar default configs for filebeat

[thll]

Sidecar default configuration templates for filebeat have the line wrapping messed up. For new clusters, or clusters that don't have the default templates present, invalid configuration will be created. See the following preview:

This PR fixes that by modifying the templates for newly created configurations. After applying the PR, the default configuration from above should look like this:

However, this won't fix existing configurations.

[thll]

@AntonEbel, do you have any idea why this was broken? I'm pretty sure the configs were tested when they were added. Also, I only tested the Darwin configs. It would be great if you could give the other configs a quick test.

[AntonEbel]

However, this won't fix existing configurations.

If the user has not changed the broken configurations, the “checksum migration” should work and we would replace them with the working configurations. Or am I wrong? @thll

[AntonEbel]

Just for traceability, this bug came in with #15571. The configurations were provided by secdev in this PR https://github.com/Graylog2/graylog-project-illuminate/issues/1384.

[thll]

If the user has not changed the broken configurations, the “checksum migration” should work and we would replace them with the working configurations. Or am I wrong? @thll

Right, if they didn't touch the config then it will be repaired.

[AntonEbel]

LGTM