tools: set eslint comma-spacing to 'warn'

Certain cases with comments inside arrays or object literals fail to
pass eslint's comma-spacing rule. This change sets the comma-spacing
rule to the 'warn' level.

Once https://github.com/eslint/eslint/issues/2408 is resolved and
released, this rule should be set back to 'error' level.

PR-URL: https://github.com/iojs/io.js/pull/1672
Reviewed-By: Yosuke Furukawa <yosuke.furukawa@gmail.com>

.eslintrc

@@ -46,7 +46,8 @@ rules:
     - 2
     - 2
   ## add space after comma
-  comma-spacing: 2
+  ## set to 'warn' because of https://github.com/eslint/eslint/issues/2408
+  comma-spacing: 1
   ## put semi-colon
   semi: 2
   ## require spaces operator like var sum = 1 + 1;
@@ -61,7 +62,6 @@ rules:
     - 80
     - 2
 
-
   # Strict Mode
   # list: https://github.com/eslint/eslint/tree/master/docs/rules#strict-mode
   ## 'use strict' on top
@@ -89,4 +89,3 @@ globals:
   DTRACE_NET_SERVER_CONNECTION: true
   LTTNG_NET_SERVER_CONNECTION: true
   COUNTER_NET_SERVER_CONNECTION: true
-