Removing "[WARNING] 'build.plugins.plugin.version' for
com.cloudbees:maven-license-plugin is missing" for the builds using
Maven 3.
Fixing testLeaseCreateInstanceJapan and testLeaseCreateInstanceSf to
compare with the module of the result time.
Fixing reservation in master. 
Related to the Issue JENKINS-17444.
Added a Test Case too.
"WARNING: Failed to timeout a reservation of 1234 on node !" was caused
by trying to access the master node with his name. 
getNodeName() in master, returns "" and cannot be found with
Hudson.getInstance().getNode(nodeName);