from: twill-discovery-api
to: twill-common
evidence:
 - file: "twill-discovery-api/src/main/java/org/apache/twill/discovery/ServiceDiscovered.java"
   contains "import org.apache.twill.common.Cancellable;"

from: twill-discovery-api
to: twill-common
evidence:
 - file: "twill-discovery-api/src/main/java/org/apache/twill/discovery/DiscoveryService.java"
   contains "import org.apache.twill.common.Cancellable;"