Made the source tarball reproducible

[larsewi]

Two builds of the same source tree now produce byte-identical tarballs, following GNU tar's reproducibility guidance. The same change 72c04dd9 made to masterfiles.

$ ./build-in-container.py --tarballs --build-type DEBUG --output-dir output/a/
---snip---
$ ./build-in-container.py --tarballs --build-type DEBUG --output-dir output/b/
---snip---
$ cat output/{a,b}/tarballs/sha256sums.txt
adefc308051307a6f7a45f062e2778fb31ea814f86c4519116a829c8b9dee758 cfengine-3.29.0a.a83bad3aa.tar.gz
ac9527080d1a389e6405656f528a3ac15e66d406536c7d2ede33135c8c31d45e cfengine-masterfiles-3.29.0a.586c7ec2f-1.pkg.tar.gz
d537ae82d86a5a0d1a8b7b10d5654d08bd0a28535b3af9c918e97fd70a303a3c cfengine-masterfiles-3.29.0a.586c7ec2f.tar.gz
adefc308051307a6f7a45f062e2778fb31ea814f86c4519116a829c8b9dee758 cfengine-3.29.0a.a83bad3aa.tar.gz
ac9527080d1a389e6405656f528a3ac15e66d406536c7d2ede33135c8c31d45e cfengine-masterfiles-3.29.0a.586c7ec2f-1.pkg.tar.gz
d537ae82d86a5a0d1a8b7b10d5654d08bd0a28535b3af9c918e97fd70a303a3c cfengine-masterfiles-3.29.0a.586c7ec2f.tar.gz

Changelog: The source tarball is now reproducible
Signed-off-by: Lars Erik Wik lars.erik.wik@northern.tech

Together with cfengine/buildscripts#2402

[larsewi]

@cf-bottom Jenkins please :)

[cf-bottom]

Alright, I triggered a build:

Jenkins:https://ci.cfengine.com/job/pr-pipeline/14415/

Packages:http://buildcache.cfengine.com/packages/testing-pr/jenkins-pr-pipeline-14415/