Trim host-id whitespace on Linux

[wathiede]

Changes

On Linux /etc/machine-id has a newline, it's unusual to have newlines in a resource value like host.id, so this change trims the whitespace around the value.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• [N/A] Unit tests added/updated (if applicable)
• [N/A] Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• [N/A] Changes in public API reviewed (if applicable)

[linux-foundation-easycla]

• ✅login: wathiede / (5e92826)

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