qa/rados: Fix problem with recompression failing osd bench tesing

qa/rados: Fix problem with recompression failing osd bench tesing

The change refactors structure of objectstore_debug/bluestore.
1) compr$ dir is not longer independant dimension.
2) compr$ dir is multiplied into write$/(v1+v2+random)
3) write$/v1 gets original compr settings
4) write$/(v2+random) get modified compr with
   osd_mclock_skip_benchmark=true

The rationale is to disable bench when both v2 and compression are enabled.

Fixes: https://tracker.ceph.com/issues/71511
Note: Not really fixes, it just disables detecting symptoms.
      Real solution needs more sophisticated approach.

Signed-off-by: Adam Kupczyk <akupczyk@ibm.com>
(cherry picked from commit c3c9e5ebad2a14a9a4d872be86df8a775b3cbf25)