AutoRefactor'ed Use Diamond Operator

Fix path canonization while computing the progressive number of the backup file.

OPENDJ-1870 CR-6581 Update BackupManager to generic tool Move pluggable.BackupManager to util.BackupManager Make util.BackupManager generic to handle any backup Add Backupable interface , to represent an entity that can be backed up Replace createBackup(), restoreBackup() and removeBackup() implementations by call to BackupManager in several classes: - jeb.BackupManager - SchemaBackend - TaskBackend - ConfigFileHandler Add new test case BackupManagerTestCase Update properties files : backend, jeb, utility