We can't set the SHA1PRNG random source reliably from within Akka. See #2977

Relying on the code to set a system property that is only used during the first load of a (Sun) Oracle private class to ensure that we use the correct random source just doesn't cut it.

Depending on test execution order and entropy on the Linux box SSL tests can fail.

I've reconfigured the Jenkins jobs on jenkins.typesafe.com to set the property on the command line.