fix: search services file in /etc/services and fall back to /usr/etc/services (#11179)

plugins/processors/port_name/services_path_notwindows.go

@@ -3,6 +3,23 @@
 
 package port_name
 
+import (
+	"os"
+)
+
+// servicesPath tries to find the `services` file at the common
+// place(s) on most systems and returns its path. If it can't
+// find anything, it returns the common default `/etc/services`
 func servicesPath() string {
-	return "/etc/services"
+	var files = []string{
+		"/etc/services",
+		"/usr/etc/services", // fallback on OpenSuSE
+	}
+
+	for i := range files {
+		if _, err := os.Stat(files[i]); err == nil {
+			return files[i]
+		}
+	}
+	return files[0]
 }