fix root readme documentation



See merge request !12

Add X-Forwarded-Port in documentation for completeness

See: gitlab-org/gitlab-ce#1967

See merge request !415

See: gitlab-org/gitlab-ce#1967

Increase the SVWAIT Timeout

We were getting a couple failed sidekiq restarts every once in a while when running gitlab-ctl restart sidekiq or if we run reconfigure after a change to the gitlab.rb. This seems to fix the problem, the specific wait time is taken from chef's updated supermarket sample app: https://github.com/chef/omnibus-supermarket/commit/4b49e200f43497192075fa612b2c0e3bae914bdd

See merge request !412

Major docs update

Reorganising README file to make it easier for a newcomer.

- [x] Move all docs in `/doc` that are not in separate directories( update.md => doc/update/README.md
- [x] Find a way to keep the existing docs so they do not break links. (check if it is worth the effort of keeping the links)
- [x] Update `/doc/README.md` to contain the index useful for doc.gitlab.com

See merge request !410

We were getting a couple failed sidekiq restarts every once in a while when running gitlab-ctl restart sidekiq or if we run reconfigure after a change to the gitlab.rb. This seems to fix the problem, the specific wait time is taken from chef's updated supermarket sample app: https://github.com/chef/omnibus-supermarket/commit/4b49e200f43497192075fa612b2c0e3bae914bdd

Check if backup:create task exists for GitLab CI before attempting to use it.

Fixes #663

See merge request !411

Secrets yml for GitLab CI

Fixes #664

See merge request !409

Check if SElinux is enforced and skip loading module if disabled.

No one supplied MR to solve it so this fixes #501 and confirmed on #660

See merge request !408