tools: enforce no unused trailing arguments tools directory

Use linting to enforce that the final argument for a function must be
used.

PR-URL: #16953
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>

Author: Trott

tools/.eslintrc.yaml

@@ -0,0 +1,4 @@
+rules:
+  # Variables
+  # http://eslint.org/docs/rules/#variables
+  no-unused-vars: [error, { args: 'after-used' }]