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

Move some project routes under - scope

See merge request gitlab-org/gitlab-ce!28830

This sets up all the basics for importing Phabricator tasks into
GitLab issues.

To import all tasks from a Phabricator instance into GitLab, we'll
import all of them into a new project that will have its repository
disabled.

The import is hooked into a regular ProjectImport setup, but similar
to the GitHub parallel importer takes care of all the imports itself.

In this iteration, we're importing each page of tasks in a separate
sidekiq job.

The first thing we do when requesting a new page of tasks is schedule
the next page to be imported. But to avoid deadlocks, we only allow a
single job per worker type to run at the same time.

For now we're only importing basic Issue information, this should be
extended to richer information.

Affected project routes are:

* services
* boards
* releases
* forks
* group_links
* import
* avatar
* labels
* milestones

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

Affected routes are:

* autocomplete_sources
* project_members
* deploy_keys
* deploy_tokens

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

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

For settings, branches and tags

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

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

This is now entirely handled by `create_note`:

1. Project snippets prevent `create_note`.
2. Uploads already only support routing for personal snippets.

This simplifies some policies and access checks, too!