ExitState.ServiceOutput is (incorrectly) interpreted as containing format specifier

[atc0005]

As noted in atc0005/check-vmware#725 (comment), the v0.9.1 release contains an unintentional change that attempts to apply formatting to literal content. The regression reappeared in the v0.9.0 release.

As of the v0.8.2 release (correct):

go-nagios/nagios.go

Lines 272 to 277 in 8d5ac27

	// One-line output used as the summary or short explanation for the
	// specific Nagios state that we are returning. We apply no formatting
	// changes to this content, simply emit it as-is. This helps avoid
	// potential issues with literal characters being interpreted as
	// formatting verbs.
	fmt.Print(es.ServiceOutput)

As of the v0.9.1 release (incorrect):

go-nagios/nagios.go

Lines 335 to 340 in 3d6cd8f

	// One-line output used as the summary or short explanation for the
	// specific Nagios state that we are returning. We apply no formatting
	// changes to this content, simply emit it as-is. This helps avoid
	// potential issues with literal characters being interpreted as
	// formatting verbs.
	fmt.Fprintf(&output, es.ServiceOutput)

This produces unexpected results when preformatted ServiceOutput content is subjected to another formatting attempt.

[atc0005]

This is a repeat of:

• Preformatted ServiceOutput string subjected to another (failed) formatting operation #58