configurations

This change introduces the necessary extension point. The implementation
of this will be in a plugin.

Update changelog for fix of JENKINS-9197

rendering issues in IE can push the button to far right. Better to left-align this to avoid this problem in case it happens

GlobalMatrixAuthorizationStrategy$DescriptorImpl.doCheckName

Fixed incorrect de-allocation of a classloader from the exported object
table.

The fix is a defense-in-depth; it prevents classloaders referenced in
the object graph from doubly released, then we also make it impossible
for bugs like this to deallocate the key classloader.

JENKINS-8641: Added a logrotate definition to the Debian/Ubuntu package.