TestIngesterTransfer fails intermittenly

[jml]

Test that relies on system clock in intermittent failing shocker. News at 9pm.

c.f. https://circleci.com/gh/weaveworks/cortex/910

--- FAIL: TestIngesterTransfer (6.01s)

	Error Trace:	ingester_lifecycle_test.go:155

	Error:		Not equal: &cortex.QueryResponse{Timeseries: []cortex.TimeSeries{cortex.TimeSeries{Labels:[]cortex.LabelPair{cortex.LabelPair{Name:wire.Bytes{0x5f, 0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x5f, 0x5f}, Value:wire.Bytes{0x66, 0x6f, 0x6f}}}, Samples:[]cortex.Sample{cortex.Sample{Value:456, TimestampMs:123000}}}},

			} (expected)

			        != &cortex.QueryResponse{} (actual)

			

			Diff:

			--- Expected

			+++ Actual

			@@ -1,2 +1,2 @@

			-(*cortex.QueryResponse)(0xc4202a21a0)(&QueryResponse{Timeseries:[{[{[95 95 110 97 109 101 95 95] [102 111 111]}] [{456 123000}]}],})

			+(*cortex.QueryResponse)(0xc4202a2180)(&QueryResponse{Timeseries:[],})