default void postDeleteSnapshot(final ObserverContext<MasterCoprocessorEnvironment> ctx,
    final SnapshotDescription snapshot) throws IOException {
  }
Called after the delete snapshot operation has been requested. Called as part of deleteSnapshot
RPC call.
@param ctx      the environment to interact with the framework and master
@param snapshot the SnapshotDescriptor of the snapshot to delete
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MasterObserver.java