failing ExecutorStepTest in jenkins versions > 2.65

[car-roll]

When running Jenkins versions > 2.65, the ExecutorStepTest.reuseNodesWithSameLabelsInDifferentReorderedStages test will fail.

This is due to changes in LoadBalancer that were done in 2.66 here: jenkinsci/jenkins#5028

Added a note to indicate this in the test code.

[dwnusbaum]

You can do something like this so the test passes against all versions:

Suggested change

	// Note: for Jenkins versions > 2.65, the number of agents must be increased to 5.
	// This is due to changes in the Load Balancer (See JENKINS-60563).
	for (int i = 0; i < 3; ++i) {
	// Note: for Jenkins versions > 2.265, the number of agents must be increased to 5.
	// This is due to changes in the Load Balancer (See JENKINS-60563).
	int totalAgents = Jenkins.getVersion().isNewerThan(new VersionNumber("2.265")) ? 5 : 3;
	for (int i = 0; i < totalAgents; ++i) {

You would also need to add an import for hudson.util.VersionNumber and I would update the Jenkinsfile to test against both the current baseline jenkins: null and the LTS candidate (jenkins: 2.277, and I would add this one to the java: 11 branch rather than adding another parallel branch).