Clean-up RPM package building

* Take into account a variable RELEASE number for packages
* No longer build out-dated documentation (user_guide & programmer_guide)

Change-Id: I87f6ade982e3bd2643541a3d9a681612cd2589cf
Merge commit 'refs/changes/56/1956/4' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Clean-up RPM package building

Change-Id: I12f2c0f95a161135454a133dda1c4c372552cc58
Tuleap 6.10.99.40

Change-Id: Idea9d255779c7184925c8e48c067d1ed3029ba6a