Add gitweb to gerrit servers.
Add gitweb to gerrit servers.

Change-Id: Ibf958392eff5011e3c150a192f4fc33abc0570aa
Reviewed-on: https://review.openstack.org/266
Reviewed-by: Monty Taylor <37c07a49ee3d5191376d758eb1d8298b34456b8e@inaugust.com>
Tested-by: Jenkins

dhiana/puppet-gerrit,open-switch/infra_puppet-gerrit,open-switch/infra_puppet-gerrit,dhiana/puppet-gerrit,dhiana/puppet-gerrit,open-switch/infra_puppet-gerrit