Better initialization of random generator

Use full time precision to initialize random generator. The old
code was prone to initialize it to the same values in specific
circumstances (boot without RTC, multiple VMs starting at once).
32 jobs for <span class="ref-name">int-new</span> in 5 minutes and 49 seconds (queued for 55 seconds)
Status Job ID Name Coverage
  Image
passed #134855
dind allowed to fail
docker_centos-6-amd64

00:00:27

passed #134856
dind allowed to fail
docker_centos-7-amd64

00:00:29

passed #134845
dind allowed to fail
docker_debian-7-amd64

00:00:25

passed #134849
dind allowed to fail
docker_debian-7-i386

00:00:28

passed #134846
dind allowed to fail
docker_debian-8-amd64

00:00:38

passed #134850
dind allowed to fail
docker_debian-8-i386

00:00:24

passed #134847
dind allowed to fail
docker_debian-9-amd64

00:00:36

passed #134851
dind allowed to fail
docker_debian-9-i386

00:00:28

passed #134848
dind allowed to fail
docker_debian-testing-amd64

00:00:28

passed #134852
dind allowed to fail
docker_debian-testing-i386

00:00:27

passed #134853
dind allowed to fail
docker_fedora-25-amd64

00:00:28

passed #134854
dind allowed to fail
docker_fedora-26-amd64

00:00:29

passed #134857
dind allowed to fail
docker_opensuse-42_3-amd64

00:00:30

passed #134858
dind allowed to fail
docker_ubuntu-14_04-amd64

00:00:30

passed #134859
dind allowed to fail
docker_ubuntu-16_04-amd64

00:00:34

 
  Build
passed #134866
docker linux amd64
build-centos-6-amd64

00:01:06

passed #134867
docker linux amd64
build-centos-7-amd64

00:01:09

passed #134860
docker linux amd64
build-debian-7-amd64

00:01:07

passed #134871
docker linux amd64
build-debian-7-i386

00:01:14

passed #134861
docker linux amd64
build-debian-8-amd64

00:01:15

passed #134872
docker linux amd64
build-debian-8-i386

00:01:16

passed #134862
docker linux amd64
build-debian-9-amd64

00:01:11

passed #134873
docker linux amd64
build-debian-9-i386

00:01:18

passed #134863
docker linux amd64
build-debian-testing-amd64

00:01:12

passed #134874
docker linux amd64
build-debian-testing-i386

00:01:15

passed #134864
docker linux amd64
build-fedora-25-amd64

00:01:09

passed #134865
docker linux amd64
build-fedora-26-amd64

00:01:09

passed #134875
freebsd amd64
build-freebsd-11-amd64

00:03:24

passed #134876
freebsd i386
build-freebsd-11-i386

00:03:45

passed #134868
docker linux amd64
build-opensuse-42_3-amd64

00:01:04

passed #134869
docker linux amd64
build-ubuntu-14_04-amd64

00:01:10

passed #134870
docker linux amd64
build-ubuntu-16_04-amd64

00:01:12