Revert "LU-4279 mdd: Fixed OBF of the FS .lustre"

This reverts commit 138fc8005169ead293b273ed2353361e985e1403.
Revert "LU-3245 mdd: Fixed OBF of the FS root"

This reverts commit 5c03a772edc14ec9fa8e5b2a8a99db37a9f13c41.
Revert "LU-2792 fld: add dot_seq into in_fldb check"

This reverts commit f8c4f5b52dba7023b13cfbb583c4b2e0300ce73a.
Revert "MRP-2021 mdd: credits for changelog calculation"

This reverts commit 4a35eed8279f1880c9edd067e7d32b0eff716b80.