Update all license headers in incubator-jclouds-cli repo

update pom.xml and src/etc/header.txt, remove malformed or duplicate headers
then execute

mvn com.mycila.maven-license-plugin:maven-license-plugin:remove
mvn com.mycila.maven-license-plugin:maven-license-plugin:format
mvn clean install
grep -R 'Licensed to jclouds, Inc.' *

Look at JCLOUDS-63 as an example