Server Side Request Forgery in Services and Web Hooks

See merge request gitlab/gitlabhq!2337

Use the EnforcedStyleForMultiline: no_comma option.
Signed-off-by: NRémy Coutable <remy@rymai.me>

Use ReactiveCaching to update external CI status asynchronously

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2055

This reverts commit 13e37a3e.

If one had configured a `teamcity_url` like http://foo.bar/teamcity in
the previous implementation the plugin directed it's request i.e. to
http://foo.bar/httpAuth/... instead of http://foo.bar/teamcity/httpAuth/...

`URI.join` only works correctly, if the prefix URL has
  - at least one or more  trailing '/'
  - the appended parts are _not_ prefixed with '/'

The current implementation should work with all sorts of TeamCity base
URLs.
Signed-off-by: NRémy Coutable <remy@rymai.me>

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

In 8278b763 the default behaviour of annotation
has changes, which was causing a lot of noise in diffs. We decided in #17382
that it is better to get rid of the whole annotate gem, and instead let people
look at schema.rb for the columns in a table.

Fixes: #17382

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

See https://gitlab.com/gitlab-org/gitlab-ce/issues/3515

Password can now be specified at the same time as the new URL, and the service
template admin pages now work.

This reverts commit b4639754.

It now allows to specify a password at the same time as the new URL, and works
on the service template admin pages.

Supports four different event types all bundled under the "note" event type:

- comments on a commit
- comments on an issue
- comments on a merge request
- comments on a code snippet

1) Adds a DB migration for all services to toggle on push, issue, and merge events.

2) Upon an issue or merge request event, fire service hooks.

3) Slack service supports custom messages for each of these events. Other services
not supported at the moment.

4) Label merge request hooks with their corresponding actions.

Strips the refs/heads/ if any to get just the branchName out of a :ref
e.g.: `refs/heads/feature/newProfile` -> `feature/newProfile`

The TeamCity buildQueue POST data require the branchName attribute
to contain just the branch name (just xyzbranch and not the full
ref in the refs/heads/xyzbranch). With the refs/heads/xyzbranch the
build is triggered and looks like it is working however it always
ompiles the default branch (or master).