Add exceptions

Change-Id: I5c63bf63338c0643a344cb8bfcc9e890c9b1c2a8
Fix tenant_id

Change-Id: Ib74415cbf0ec3a8e5eaa85c7154f47c131cbbc1a
Add get qoses method

Change-Id: Ia359791fa8cbe871b88649c7bc93d14a03e0e191