fixing a test failure
for improving the test performance, running this with the default local repository
[maven-release-plugin] prepare release jenkins-1.520
[maven-release-plugin] prepare for next development iteration
updated changelog for release
updated changelog as a part of the release
merged back the RC branch

Conflicts:
	test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java
creating an RC branch
the trunk is toward 1.522-SNAPSHOT
fixed typo
[FIXED JENKINS-18438]

Node monitoring should run in parallel to reduce the total round-trip
time in large instances.