This tool has two commands to execute. One is to 'report'
orphaned segments. Second to 'delete' orphaned
segments.
To find such segments tool is first finding all unique
segment stream ids. As a next step its removing from this
list stream ids of existing objects. What is left is a list of
orphaned segments.
Change-Id: I4a0ae3ad0b10a8d16572bfd22ac92cfa15ca19b3
