Shrink and hard-code rlist for test with very small box

The size of the cutoff is not material for the functioning of this
test, but it was making twofold parallelism impossible in double
precision, and with GPUs, because the buffer is too large for
the box.

Change-Id: I564672f4b6709e1d2de0228d2c65fabebc569796
Merge release-4-6 into release-5-0

Conflicts (regenerated):
	complex/nbnxn_vsite/reference_d.edr
	complex/nbnxn_vsite/reference_d.log
	complex/nbnxn_vsite/reference_d.tpr
	complex/nbnxn_vsite/reference_d.trr
	complex/nbnxn_vsite/reference_s.edr
	complex/nbnxn_vsite/reference_s.log
	complex/nbnxn_vsite/reference_s.tpr
	complex/nbnxn_vsite/reference_s.trr

Change-Id: I27c83d06ddd9505cbab659401ff240de0a768a08