Fix #1701 - cleanup code for zero-size data transfer.
Delete code for zero-size data transfer in packet handlers of Put/Accumulate/Accumulate_Immed/Get_AccumulateResp/GetResp/ LockPutUnlock/LockAccumUnlock, because they are redundant. (Note that packet handlers of LockPutUnlock and LockAccumUnlock are for single operation optimization in passive RMA) Zero-size data transfer has already been handled when issuing RMA operations (L146, L258, L369 in src/mpid/ch3/src/ch3u_rma_ops.c and L50 in src/mpid/ch3/src/ch3u_rma_acc_ops.c). RMA operation routines will directly exit if data size is zero. Signed-off-by: Wesley Bland <email@example.com>