b=19427 Correct lmm_object_id

b=19427 Correct lmm_object_id

o=adilger
i=wangdi
i=tapro
i=pravin
i=rahul

Fix boolean logic for limiting the maximum object ID created within a
single group (sequence).  For legacy IDIF objects this is 2^48 objects,
since we consume 2^16 SEQ numbers for the high bits of the object ID),
but for all other groups it is only 2^32 objects that can fit into f_oid.

Clean up some duplicate #defines that are no longer needed now that
we declare all of the FID_SEQ values in enum fid_seq in lustre_idl.h.