tools: remove legacy indentation linting

All linting now uses the current ESLint 4.3.0 indentation linting.
Remove legacy indentation rules.

PR-URL: https://github.com/nodejs/node/pull/14515
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Claudio Rodriguez <cjrodr@yahoo.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>

tools/.eslintrc.yaml

@@ -1,13 +0,0 @@
-## Tools-specific linter rules
-
-rules:
-  # Stylistic Issues
-  # http://eslint.org/docs/rules/#stylistic-issues
-  indent: [error, 2, {ArrayExpression: first,
-                      CallExpression: {arguments: first},
-                      FunctionDeclaration: {parameters: first},
-                      FunctionExpression: {parameters: first},
-                      MemberExpression: off,
-                      ObjectExpression: first,
-                      SwitchCase: 1}]
-  indent-legacy: off