JCLOUDS-31 License header update in jclouds/jclouds

executed the following after the first commit:
```
mvn com.mycila.maven-license-plugin:maven-license-plugin:remove
mvn com.mycila.maven-license-plugin:maven-license-plugin:format
mvn clean install
```
If this passes review, I can do the same thing for all branches and repos.