better system test entropy

- use /dev/urandom in gitlab CI
- use genrandom to get 4k of data instead of 800 bytes
- set this value as RANDOMSIZE in conf.sh
18 jobs for systest-entropy in 7 minutes and 38 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Precheck
passed precheck:debian:sid:amd64 #98303
amd64 docker linux

00:00:20

 
  Build
passed build:centos:centos6:amd64 #98304
amd64 docker linux

00:02:08

passed build:centos:centos7:amd64 #98305
amd64 docker linux

00:02:19

passed build:debian:sid:amd64 #98306
amd64 docker linux

00:01:53

passed build:debian:sid:i386 #98307
i386 docker linux

00:02:00

passed noassert:build:debian:sid:amd64 #98308
amd64 docker linux

00:01:54

 
  Test
passed docs:debian:sid:amd64 #98309
amd64 docker linux

00:00:48

passed install:debian:sid:amd64 #98318
amd64 docker linux

00:01:38

passed noassert:systemtest:debian:sid:amd64 #98320
amd64 docker linux

00:04:56

passed noassert:unittest:debian:sid:amd64 #98319
amd64 docker linux

00:00:47

passed systemtest:centos:centos6:amd64 #98314
amd64 docker linux

00:04:48

passed systemtest:centos:centos7:amd64 #98315
amd64 docker linux

00:04:47

passed systemtest:debian:sid:amd64 #98316
amd64 docker linux

00:04:48

passed systemtest:debian:sid:i386 #98317
i386 docker linux

00:04:49

passed unittest:centos:centos6:amd64 #98310
amd64 docker linux

00:00:49

passed unittest:centos:centos7:amd64 #98311
amd64 docker linux

00:00:52

passed unittest:debian:sid:amd64 #98312
amd64 docker linux

00:00:48

passed unittest:debian:sid:i386 #98313
i386 docker linux

00:00:49