Enforce no unused imports via Checkstyle

Removed with:

mvn checkstyle:checkstyle --quiet -Dcheckstyle.output.file=/dev/stdout -Dcheckstyle.output.format=plain | tac | while read i; do echo $i | sed -n 's/\([^:]*\):\([^:]*\):.*/sed -i \2d \1/p' | bash; done

providers/enterprisechef/src/main/java/org/jclouds/enterprisechef/EnterpriseChefApiMetadata.java

@@ -19,7 +19,6 @@ package org.jclouds.enterprisechef;
 import java.net.URI;
 import java.util.Properties;
 
-import org.jclouds.apis.ApiMetadata;
 import org.jclouds.chef.ChefApiMetadata;
 import org.jclouds.chef.ChefContext;
 import org.jclouds.chef.config.ChefBootstrapModule;