Ramp Time Bug

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Using ramp_time is causing all min values (slat/clat/lat/bw/iops) to report 0.
Removing ramp_time fixes the issue.

Job file:
[rnd-8020]
ioengine=libaio
direct=1
bs=4k
rw=randrw
rwmixread=80
numjobs=1
iodepth=32
runtime=10
time_based
norandommap
randrepeat=0
filename=/dev/sdb
#ramp_time=10

Fio output with min values zeroed:
rnd-8020: (g=0): rw=randrw, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
4096B-4096B, ioengine=libaio, iodepth=32
fio-3.12-45-g771c
Starting 1 process
Jobs: 1 (f=1): [m(1)][100.0%][r=149MiB/s,w=37.4MiB/s][r=38.1k,w=9562
IOPS][eta 00m:00s]
rnd-8020: (groupid=0, jobs=1): err= 0: pid=4701: Thu Dec 13 14:14:36 2018
  read: IOPS=33.6k, BW=131MiB/s (138MB/s)(1313MiB/10002msec)
    slat (nsec): min=0, max=14301, avg=1880.55, stdev=242.49
    clat (nsec): min=0, max=9948.1k, avg=633109.98, stdev=597207.47
     lat (nsec): min=0, max=9950.0k, avg=635050.69, stdev=597212.18
    clat percentiles (usec):
     |  1.00th=[  135],  5.00th=[  165], 10.00th=[  178], 20.00th=[  202],
     | 30.00th=[  227], 40.00th=[  251], 50.00th=[  285], 60.00th=[  379],
     | 70.00th=[  873], 80.00th=[ 1270], 90.00th=[ 1565], 95.00th=[ 1762],
     | 99.00th=[ 2212], 99.50th=[ 2606], 99.90th=[ 3851], 99.95th=[ 4015],
     | 99.99th=[ 5211]
   bw (  KiB/s): min=    0, max=164608, per=100.00%, avg=134473.20,
stdev=12836.10, samples=20
   iops        : min=    0, max=41152, avg=33618.30, stdev=3209.03, samples=20
  write: IOPS=8419, BW=32.9MiB/s (34.5MB/s)(329MiB/10002msec); 0 zone resets
    slat (nsec): min=0, max=13697, avg=2059.16, stdev=383.41
    clat (nsec): min=0, max=10090k, avg=1261001.47, stdev=575428.55
     lat (nsec): min=0, max=10092k, avg=1263121.22, stdev=575424.23
    clat percentiles (usec):
     |  1.00th=[  474],  5.00th=[  635], 10.00th=[  709], 20.00th=[  807],
     | 30.00th=[  898], 40.00th=[  996], 50.00th=[ 1106], 60.00th=[ 1237],
     | 70.00th=[ 1418], 80.00th=[ 1680], 90.00th=[ 2089], 95.00th=[ 2376],
     | 99.00th=[ 3064], 99.50th=[ 3523], 99.90th=[ 4424], 99.95th=[ 4752],
     | 99.99th=[ 5866]
   bw (  KiB/s): min=    0, max=40240, per=100.00%, avg=33682.40,
stdev=3069.64, samples=20
   iops        : min=    0, max=10060, avg=8420.60, stdev=767.41, samples=20
  lat (usec)   : 100=0.20%, 250=31.37%, 500=20.39%, 750=5.34%, 1000=8.79%
  lat (msec)   : 2=30.07%, 4=3.76%, 10=0.08%, 20=0.01%
  cpu          : usr=9.58%, sys=12.38%, ctx=406871, majf=0, minf=15
  IO depths    : 1=0.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=100.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0%
     issued rwts: total=336181,84209,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=32



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