Branch HEAD

Branch HEAD
Fix a serious interoperability problem between quotas on HEAD and b1_x,
becuase the quota request messages had been assigned different message
numbers due to "conflict" with FLD_QUERY RPCs.  Since FLD_QUERY does
not exist in any released Lustre, that RPC message number was changed
instead and the DQACQ and DQREL RPCs now match b1_x.

This was made obvious by comparing the lustre_idl.h files between b1_8
and HEAD, so this patch also includes the (otherwise cosmetic) changes
to lustre_idl.h to make it match with b1_8.
b=17800