Fix community #5803 : I was not able to not define an http_port for Gerrit servers

Change-Id: Ic43d8840769222602c1c2db029d87fb2d568150b
Merge commit 'refs/changes/00/1600/1' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Fix community #5803 : I was not able to not define an http_port for Gerrit servers

Change-Id: Ibf0308dd061a850668b62cebe81b93bf1638e232
This is Tuleap 6.8.99.15

Change-Id: Iec1cf95317c563243b42690774550e46342443ee