Add parameters for Gitlab 8

[alexcern]

Other features:

• logrotate template to correctly handle logrotate config when not using default git_home
• gitlab_uploads_folder to customize location of uploads
• updated defaults and config files to match values recommended for GitLab nowadays (as per GitLab support files)
• support kerberos authentication with dedicated port (EE only)
• remove deprecated parameters moved a long time ago out of gitlab.yml into Application Settings UI (GitLab 7.7) and the Services Templates (GitLab 7.8):

gitlab_support_email, gitlab_projects, gitlab_restricted_visibility_levels, gitlab_default_projects_features_wall, gitlab_default_projects_features_visibility_level, issues_tracker, company_logo_url, company_link, company_name

Fixes #234 and #235

[alexcern]

Here's a first version.

I'm successfully managing instances running GitLab 7.13 or 8.1 with this, including advanced settings such as Kerberos and Omniauth. However I'm lacking time to make lint happy and adjust the tests (some defaults changed and indentation may be a bit different in config files as I used more recent config templates provided by GitLab); any help would be very welcome in this area.

To deploy GitLab 8+, make sure to specify a branch for gitlab_git_http_server in order to install this required dependency (but don't install it with GitLab 7.X, Git HTTP access wouldn't work anymore)

class { 'gitlab':
  ensure => 'present',
  gitlab_branch => 'v8.1.2',
  gitlab_git_http_server_branch => '0.3.0',
}