Support --gitlab-server param for pages

Vladimir Shushlinrequested to merge
pages-gitlab-server-param into master

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/28996

In gitlab-pages!141 (comment 167887781) we replaced --auth-server param to --gitlab-server

This MR adds support of this param to omnibus. We use auth-server as default for gitlab-server for backward compatibility

Edited by GitLab Release Tools Bot

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