warn if unallocated space is found

tests/test_partitions.py

@@ -79,6 +79,7 @@ def check_allocation(dev):
     unallocated = max_size - total_size
     unallocated_gbytes = to_gbytes(unallocated)
     if unallocated_gbytes > 1:
+        print('Warning, %s GB are unallocated on %s' % (unallocated_gbytes, root_dev))
         return False
     return True