* Disable Windows builds, ATH and Incrementals to mitigate the ongoing INFRA issue

See https://groups.google.com/forum/#!topic/jenkinsci-dev/v9d-XosOp2s is resolved

* Restore incrementals publishing

* Run the Linux JDK 8 & 11 builds using ACI agents rather than Ubuntu VMs.

* A couple of tests failed when run as root.

* Since https://github.com/jenkinsci/jnlp-agents/pull/5 is as yet undeployed, install packages ourselves as a workaround.

* Revert "Since https://github.com/jenkinsci/jnlp-agents/pull/5 is as yet undeployed, install packages ourselves as a workaround."
This reverts commit 2f7e84d67a86e5efbd02305e555f572ca36fd1a4.
The changes have been deployed, so the workaround is no longer necessary.

https://ci.jenkins.io/job/Core/job/jenkins/job/master/1179/execution/node/38/log/?consoleFull
[WARNING] Corrupted stdin stream in forked JVM 2. See the dump file /home/jenkins/workspace/Core_jenkins_master-CZB5BLBJFXZE2BKR63DSXQKXRZJAOWBX73QP55GU5KMX7AHAF6CQ/test/target/surefire-reports/2018-12-12T10-57-04_077-jvmRun2.dumpstream

- just running the tests

Backports Jenkinsfile from the java11-support branch

war/src/test/js/ apparently produces war/target/surefire-reports/JasmineReport.xml without the TEST- prefix used by Surefire.

Obsolete with Java 8. Permanent generation was removed.

* Reference redirectors and jenkins.io as much as possible

* Something went wrong, so this is a troubleshooting URL

* More specific redirect URLs

This will allow PRs to resolve failing tests on Windows