When configuring an automated performance test in Jenkins, users should be able to use the Jenkins Credentials to supply the username/password fields in the configuration.  

We use a single PC service account to execute CI Performance Tests, and we do not necessarily want to hand out those credentials to our contractors who configure those tests.  It would be more secure to setup a Jenkins Credential, and use that.

Also, this would alleviate issue of when the account password expires; we would only need to update the password for the jenkins credential, instead of having to update multiple (near 100) jenkins jobs.