Update run.js

switched to if statement to not alter the default. Added a small/basic check to only accept a dns value with at least 7 characters.

Author: dboek

lib/run.js

@@ -18,7 +18,9 @@ module.exports = function (docker, job, provider, plugins, config, next) {
     env: env,
   }, config.branchConfig.runner.config)
   slaveConfig.image = slaveConfig.image || "strider/strider-docker-slave"
-  slaveConfig.dns   = (slaveConfig.dns || "").length == 0 ? ["8.8.8.8"] : slaveConfig.dns.split(",")
+  if (slaveConfig.dns && slaveConfig.dns.length > 6) {
+    slaveConfig.dns   = slaveConfig.dns.split(",")
+  }
   config.io.emit('job.status.command.comment', job._id, {
     comment: 'Creating docker container from ' + slaveConfig.image,
     plugin: 'docker',