audit: Timeout audit requests eventually

Author: iarna

lib/install.js

@@ -761,7 +761,8 @@ Installer.prototype.printInstalled = function (cb) {
     })
   }
   return Bluebird.try(() => {
-    return this.auditSubmission && this.auditSubmission.catch(() => null)
+    if (!this.auditSubmission) return
+    return Bluebird.resolve(this.auditSubmission).timeout(10000).catch(() => null)
   }).then((auditResult) => {
     // maybe write audit report w/ hash of pjson & shrinkwrap for later reading by `npm audit`
     if (npm.config.get('json')) {