manoelcampos/cloudsimplus: v7.1.0 :: Fix VM Migration

1. Critical bug fixes #352 - VM migration was not working 2. Network module Makes NetworkDatacenter accept only NetworkHosts Makes NetworkDatacenter.getHostList() return a List 3. Compatibility break 3.1 More impacting changes Renames CloudSimTags to CloudSimTag, making it an enum: event tags were int constants in CloudSimTags class. Now, if you are sending custom events in your simulation, you need to move your int tags into the new CloudSimTag enum. Renames CloudSimTag starting with DATACENTER to DC 3.2 Less impacting changes Makes SanStorage.getFile() to return an Optional Makes SanStorage.deleteFile() to return an Optional Throws exception when a file or its file name is invalid, instead of returning a boolean and logging a message Renames Cloudlet.requiresFiles() to hasRequiresFiles Makes VmSelectionPolicy.getVmToMigrate to return Optional Renames LognormalDistr class to LogNormalDist