Refactor: implement the managesnapshot.sh features via Java and remove the script #6424

Several snapshot functionalities, in KVM, are implemented via the script scripts/storage/qcow2/managesnapshot.sh. From #6422 (comment) came the idea to improve these processes by ​​implementing the functionalities via Java, adding documentation, unit tests and logs.

ISSUE TYPE

• Improvement Request

COMPONENT NAME

KVM