fix(scripts): correct usage and help exit status (#143)

tests/x-localip.bats

@@ -5,3 +5,9 @@
   [ "$status" -eq 0 ]
   [[ "$output" == "x-localip version"* ]]
 }
+
+@test "x-localip help" {
+  run bash local/bin/x-localip --help
+  [ "$status" -eq 0 ]
+  [[ "$output" == "Usage:"* ]]
+}