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

This reverts commit 811bb9bfdab43cebce5138ee8b6dc7ba6d0fd41d.
Revert "LU-3245 mdd: Fixed OBF of the FS root"

This reverts commit 510f0a2278d823c14d080d1a1d69b86511c9ec27.
Revert "LU-2792 fld: add dot_seq into in_fldb check"

This reverts commit 4549a86103b835b4eca82f71470b593275d82d9a.
Revert "MRP-2021 mdd: credits for changelog calculation"

This reverts commit 058244057147a31b436b130839dedaf7ac8c34b6.