Fix deal with non standard mysql port on installation

Change-Id: Ia1e44016427dfed983bab3d67c11ca098f2c6b5e
Merge commit 'refs/changes/96/696/4' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix deal with non standard mysql port on installation

Change-Id: I8af5769372b3598ce47c87aa96cb3dd7056c4262
Tuleap 6.3.99.5

Change-Id: I29062b8c12b553d4b8dfbdea9d7465346e13bbba