Admin area - sorting groups by name works unexpectedly
### Summary
In the admin area, when looking at the list of groups, if the "Name" sort is chosen, the groups do not SEEM to be sorted by name. It took a lot of head-scratching to figure out what's going on. They actually are sorted by name, but it's the last name in the hierarchy, rather than the first name. So here's a contrived example of a group order that this would produce:
```
dev / api
beeps
git
zip / jump
test
apple / view
```
When viewing groups outside of the admin area, sorting them by name puts them in what I consider to be a logical order. In that view the hierarchy is more obvious, because the top level must be expanded to see the children.
I think this was working as expected in version 9.1.2. Today I upgraded to 9.5.10 and then 10.8.4, using the yum repository.
### Steps to reproduce
Click the wrench to get to the admin area, click groups on the left. In the sort dropdown next to "New group", choose "Name". Choosing "Name, descending" shows the same order in reverse.
#### Results of GitLab environment info
```
System information
System:
Current User: git
Using RVM: no
Ruby Version: 2.3.7p456
Gem Version: 2.6.14
Bundler Version:1.13.7
Rake Version: 12.3.1
Redis Version: 3.2.11
Git Version: 2.16.4
Sidekiq Version:5.0.5
Go Version: unknown
GitLab information
Version: 10.8.4
Revision: 2268d0c
Directory: /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: postgresql
URL: https://gitlab.mainstreamdata.com
HTTP Clone URL: https://gitlab.mainstreamdata.com/some-group/some-project.git
SSH Clone URL: git@gitlab.mainstreamdata.com:some-group/some-project.git
Using LDAP: no
Using Omniauth: no
GitLab Shell
Version: 7.1.2
Repository storage paths:
- default: /var/opt/gitlab/git-data/repositories
Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks
Git: /opt/gitlab/embedded/bin/git
```
#### Results of GitLab application Check
```
Checking GitLab Shell ...
GitLab Shell version >= 7.1.2 ? ... OK (7.1.2)
Repo base directory exists?
default... yes
Repo storage directories are symlinks?
default... no
Repo paths owned by git:root, or git:git?
default... yes
Repo paths access is drwxrws---?
default... yes
hooks directories in repos are links: ...
4/2 ... ok
7/4 ... ok
8/5 ... ok
12/6 ... ok
8/7 ... ok
14/8 ... ok
16/9 ... ok
15/10 ... ok
14/11 ... ok
15/12 ... ok
15/13 ... ok
15/14 ... ok
23/15 ... ok
15/16 ... ok
15/17 ... ok
20/18 ... ok
20/19 ... ok
16/20 ... ok
16/21 ... ok
22/23 ... ok
16/24 ... ok
25/25 ... ok
25/26 ... ok
26/27 ... ok
6/28 ... ok
27/29 ... ok
26/30 ... ok
26/31 ... ok
28/32 ... ok
26/33 ... ok
14/34 ... ok
31/35 ... ok
32/36 ... ok
35/37 ... ok
36/39 ... ok
28/41 ... ok
38/43 ... ok
38/45 ... ok
38/46 ... ok
40/47 ... ok
40/48 ... ok
40/49 ... ok
39/50 ... ok
14/51 ... ok
26/52 ... ok
23/53 ... ok
14/54 ... ok
14/55 ... ok
14/56 ... repository is empty
14/57 ... ok
8/58 ... ok
26/59 ... ok
41/60 ... ok
41/61 ... ok
26/62 ... ok
41/63 ... ok
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Check GitLab API access: OK
Redis available via internal API: OK
Access to /var/opt/gitlab/.ssh/authorized_keys: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Sidekiq ...
Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Reply by email is disabled in config/gitlab.yml
Checking LDAP ...
LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
4/2 ... yes
7/4 ... yes
8/5 ... yes
12/6 ... yes
8/7 ... yes
14/8 ... yes
16/9 ... yes
15/10 ... yes
14/11 ... yes
15/12 ... yes
15/13 ... yes
15/14 ... yes
23/15 ... yes
15/16 ... yes
15/17 ... yes
20/18 ... yes
20/19 ... yes
16/20 ... yes
16/21 ... yes
22/23 ... yes
16/24 ... yes
25/25 ... yes
25/26 ... yes
26/27 ... yes
6/28 ... yes
27/29 ... yes
26/30 ... yes
26/31 ... yes
28/32 ... yes
26/33 ... yes
14/34 ... yes
31/35 ... yes
32/36 ... yes
35/37 ... yes
36/39 ... yes
28/41 ... yes
38/43 ... yes
38/45 ... yes
38/46 ... yes
40/47 ... yes
40/48 ... yes
40/49 ... yes
39/50 ... yes
14/51 ... yes
26/52 ... yes
23/53 ... yes
14/54 ... yes
14/55 ... yes
14/56 ... yes
14/57 ... yes
8/58 ... yes
26/59 ... yes
41/60 ... yes
41/61 ... yes
26/62 ... yes
41/63 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.5 ? ... yes (2.3.7)
Git version >= 2.9.5 ? ... yes (2.16.4)
Git user has default SSH configuration? ... yes
Active users: ... 14
Checking GitLab ... Finished
```
issue