story #7508 - build srpm before building rpms

Change-Id: I3e658dc03131e31096aed71a783a1760ede62e6c
Merge commit 'refs/changes/51/3151/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7508 - build srpm before building rpms
This is Tuleap 7.6.99.9

Change-Id: Ide2d9b8b74ae264a7abf8c2881cec2fca5bc5e5a