90th and 95th latency increased by 3X for compression disabled 10RR test

Test : 

90th percentile secondary scan latency (ms), 1 bucket x 250M, single 2i index, 10K KV ops/sec, 10% Resident, PLASMA, Compression disabled 80/20

95th percentile secondary scan latency (ms), 1 bucket x 250M, single 2i index, 10K KV ops/sec, 10% Resident, PLASMA, Compression disabled 80/20

Test run: http://perf.jenkins.couchbase.com/job/hemera/3693/console 

cbmonitor: 

http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=hemera_710-2071_apply_scanworkload_7611&snapshot=hemera_710-2102_apply_scanworkload_8d5b