Added selected pool to logs on migrate operation.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/tape_client.py

@@ -152,7 +152,7 @@ class TapeClient(object):
         A tape pool and a VOSpace jobId are also required
         as parameters.
         """
-        self.logger.info("Starting MIGRATE operation...")
+        self.logger.info(f"Starting MIGRATE operation (tape pool = '{tapePool}')...")
         migrateFileList = f"vos_migrate-{jobId}.lst"
         try:
             fp = open(migrateFileList, "a")