Tests for checkstyle publisher

Should be straightforward, the publisher checkstyle simply lacked tests.
Also make use of literal include for the examples.

Change-Id: I000cdee47bb0938af9f327bcaba06b87f8287739
Allow 'Build on the same node' in trigger-builds builder

In `trigger-builds` builder, create the
'<hudson.plugins.parameterizedtrigger.NodeParameters/>'
element if 'same-node' parameter is set to 'true'.

This adds the configurability of the 'Build on the same node'
parameter.

Change-Id: I3b6fa0a50b74932ad9837c7b88835b8b0c9c23ec
Merge "Tests for checkstyle publisher"
Merge "Allow 'Build on the same node' in trigger-builds builder"