Sidecar hangs during restart

[danotorrey]

[HS 1308449306]

Problem description

When attempting to restart a Sidecar, the restart process hangs and gets stuck in an infinite loop if the shutdown of the sidecar takes more than 5 seconds.

A possible source of the issue is here, where a 5 second timeout is hard-coded:
https://github.com/Graylog2/collector-sidecar/blob/1.3/daemon/exec_runner.go#L264

The problem might also be compounded by large sidecar configurations.

Environment

• Sidecar Version: 1.2.0
• Graylog Version: 4.3.9
• Operating System:
• Elasticsearch Version:
• MongoDB Version:

[mpfz0r]

Fixed with #462