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Merge pull request #1334 from damienfinck/master

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[maven-release-plugin] prepare release jenkins-1.584
[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
creating an RC branch
the trunk is toward 1.586-SNAPSHOT
[JENKINS-11543] Unit test
read access to log file useful for plugins like support-core
Added a method to read a file from the middle
Release note mess-up.

These items are meant for 1.584
Factored out common code into applyErrorMessage function.
When a server error is caught by applyErrorMessage (“ERROR” link), do not render the whole oops.jelly page.
Just pick out the <div id="error-description"> from JENKINS-20772.
NPE in form validation when configured on a non-AbstractProject, like a workflow job.
t:listScmBrowsers was not working inside f:dropdownDescriptorSelector.
It assumed it was used only inside config-scm.jelly, so assumed it could use ${scmd}
rather than the more standard ${descriptor}.