Merge branch 'issue_18656' into 'master'

Load issue templates from repository

part of #18656 


## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4981
76 jobs from master in 1218 minutes and 45 seconds (queued for 7 minutes and 39 seconds)
Status Job ID Name Coverage
  Prepare
passed #3141324
knapsack

00:01:21

 
  Test
passed #3141658
bundler:audit

00:02:49

passed #3141653
license_finder

00:03:25

passed #3141657
lint-doc

00:03:31

passed #3141649
rake brakeman

00:03:24

passed #3141655
rake db:migrate:reset

00:03:21

passed #3141654
rake downtime_check

00:02:35

passed #3141652
rake flay

00:02:14

passed #3141651
rake flog

00:02:13

passed #3141647
rake scss_lint

00:02:26

passed #3141584
rspec 0 20

00:20:25

passed #3141615
rspec 0 20 ruby21

00:22:10

passed #3141585
rspec 1 20

00:18:28

passed #3141616
rspec 1 20 ruby21

00:24:38

passed #3141594
rspec 10 20

00:22:05

passed #3141626
rspec 10 20 ruby21

00:20:29

passed #3141595
rspec 11 20

00:22:29

passed #3141627
rspec 11 20 ruby21

00:24:10

passed #3141596
rspec 12 20

00:25:31

passed #3141628
rspec 12 20 ruby21

00:27:48

passed #3141597
rspec 13 20

00:20:17

passed #3141629
rspec 13 20 ruby21

00:26:16

passed #3141598
rspec 14 20

00:17:53

passed #3141630
rspec 14 20 ruby21

00:21:39

passed #3141599
rspec 15 20

00:20:45

passed #3141631
rspec 15 20 ruby21

00:20:47

passed #3141600
rspec 16 20

00:21:45

passed #3141632
rspec 16 20 ruby21

00:24:43

passed #3141601
rspec 17 20

00:23:50

passed #3141633
rspec 17 20 ruby21

00:22:50

passed #3141602
rspec 18 20

00:20:36

passed #3141634
rspec 18 20 ruby21

00:23:26

passed #3141603
rspec 19 20

00:17:28

passed #3141635
rspec 19 20 ruby21

00:27:21

passed #3141586
rspec 2 20

00:29:37

passed #3141617
rspec 2 20 ruby21

00:23:41

passed #3141587
rspec 3 20

00:18:15

passed #3141618
rspec 3 20 ruby21

00:23:04

passed #3141588
rspec 4 20

00:24:37

passed #3141619
rspec 4 20 ruby21

00:25:05

passed #3141589
rspec 5 20

00:22:42

passed #3141620
rspec 5 20 ruby21

00:22:35

passed #3141590
rspec 6 20

00:27:23

passed #3141621
rspec 6 20 ruby21

00:25:48

passed #3141591
rspec 7 20

00:19:05

passed #3141623
rspec 7 20 ruby21

00:15:26

passed #3141592
rspec 8 20

00:19:12

passed #3141624
rspec 8 20 ruby21

00:19:01

passed #3141593
rspec 9 20

00:16:54

passed #3141625
rspec 9 20 ruby21

00:23:01

passed #3141646
rubocop

00:04:21

passed #3141604
spinach 0 10

00:14:29

passed #3141636
spinach 0 10 ruby21

00:15:26

passed #3141606
spinach 1 10

00:12:51

passed #3141637
spinach 1 10 ruby21

00:12:39

passed #3141607
spinach 2 10

00:09:33

passed #3141638
spinach 2 10 ruby21

00:15:56

passed #3141608
spinach 3 10

00:13:47

passed #3141639
spinach 3 10 ruby21

00:12:05

passed #3141609
spinach 4 10

00:12:52

passed #3141640
spinach 4 10 ruby21

00:14:02

passed #3141610
spinach 5 10

00:11:33

passed #3141641
spinach 5 10 ruby21

00:13:01

passed #3141611
spinach 6 10

00:15:37

passed #3141642
spinach 6 10 ruby21

00:19:15

passed #3141612
spinach 7 10

00:14:59

passed #3141643
spinach 7 10 ruby21

00:22:37

passed #3141613
spinach 8 10

00:12:34

passed #3141644
spinach 8 10 ruby21

00:13:41

passed #3141614
spinach 9 10

00:11:55

passed #3141645
spinach 9 10 ruby21

00:11:14

passed #3141656
teaspoon

00:05:02

 
  Post Test
passed #3142535
coverage

00:04:34

passed #3142534
update-knapsack

00:01:49

 
  Pages
passed #3142673
pages

00:01:35

 
  Deploy
passed pages:deploy

00:00:05