sandbox: wrap fmsg interface

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/output.go

@@ -2,11 +2,15 @@ package internal
 
 import (
 	"git.gensokyo.uk/security/fortify/internal/fmsg"
+	"git.gensokyo.uk/security/fortify/internal/sandbox"
 	"git.gensokyo.uk/security/fortify/seccomp"
+	"git.gensokyo.uk/security/fortify/system"
 )
 
 func InstallFmsg(verbose bool) {
 	fmsg.Store(verbose)
+	sandbox.SetOutput(fmsg.Output{})
+	system.SetOutput(fmsg.Output{})
 	if verbose {
 		seccomp.SetOutput(fmsg.Verbose)
 	}