Let ssh-client use the SDK's forgekey, and let the checks accept a module's own .ssh (issues 1480, 1484), part 2 of 17

modules/ssh-client/cmd/ssh-client-tools/firstline.go

@@ -0,0 +1,13 @@
+package main
+
+import "strings"
+
+// firstLine is the first non-empty line of s, trimmed.
+func firstLine(s string) string {
+	for _, l := range strings.Split(s, "\n") {
+		if l = strings.TrimSpace(l); l != "" {
+			return l
+		}
+	}
+	return ""
+}