The `empty?` check was iterating over all Wiki pages to determine
whether it was empty. Using the limit parameter allows us to bail
out early once we found a page.

Note that this currently only improves performance for GitLab 11.0
until https://gitlab.com/gitlab-org/gitaly/issues/1204 is fixed.

Relates to #40101

Fixes #43715

Hooks were run for wikis, but given the internal API wasn't responding
failures happended, as seen on:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18693

Direct disk access is done through Gitaly now, so the legacy path was
deprecated. This path was used in Gitlab::Shell however. This required
the refactoring in this commit.

Added is the removal of direct path access on the project model, as that
lookup wasn't needed anymore is most cases.

Closes https://gitlab.com/gitlab-org/gitaly/issues/1111

Fixes gitaly#1126

Prior to this change, this method was called add_namespace, which broke
the CRUD convention and made it harder to grep for what I was looking
for. Given the change was a find and replace kind of fix, this was
changed without opening an issue and on another feature branch.

If more dynamic calls are made to add_namespace, these could've been
missed which might lead to incorrect bahaviour. However, going through
the commit log it seems thats not the case.

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Closes gitaly#689

Closes gitaly#677

Closes gitaly#673

Closes gitaly#638

Signed-off-by: NRémy Coutable <remy@rymai.me>

Signed-off-by: NRémy Coutable <remy@rymai.me>

Remove superfluous lib: true, type: redis, service: true, models: true, services: true, no_db: true, api: true
Signed-off-by: NRémy Coutable <remy@rymai.me>

This partially reverts be25bbc4.
Signed-off-by: NRémy Coutable <remy@rymai.me>

New Gitlab::UrlSanitizer.http_credentials_for_user method responsible
for generating a credentials hash from a user.
Signed-off-by: NRémy Coutable <remy@rymai.me>

This reverts commit cb10b725c8929b8b4460f89c9d96c773af39ba6b.

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

Added "wiki" section and removed "repository"

This reverts commit 4cc85a58, reversing
changes made to 90ae445b.
Signed-off-by: NRémy Coutable <remy@rymai.me>