tools: apply stricter indentation rules to tools

ESLint 4.0.0 provides stricter (and more granular) indentation checking
than previous versions. Apply the stricter indentation rules to the
tools directory.

Backport-PR-URL: #14360
PR-URL: #13758
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

tools/.eslintrc.yaml

@@ -0,0 +1,12 @@
+## Tools-specific linter rules
+
+rules:
+  # Stylistic Issues
+  # http://eslint.org/docs/rules/#stylistic-issues
+  indent: [2, 2, {ArrayExpression: first,
+                  CallExpression: {arguments: first},
+                  FunctionDeclaration: {parameters: first},
+                  FunctionExpression: {parameters: first},
+                  MemberExpression: off,
+                  ObjectExpression: first,
+                  SwitchCase: 1}]