ldap integration in not listing all memberuid through gitlab-rake gitlab:ldap:check and users cannot login to gitlab


### Summary

ldap integration in not listing all memberuid through  gitlab-rake gitlab:ldap:check and users cannot login to gitlab

#### Error 
Getting **Could not authenticate you from Ldapmain because "Invalid credentials for *****".** while login to gitlab

### Steps to reproduce

Below query results more than 10 memberUid
ldapsearch -H ldap://ldap-server:389 -D "cn=******,ou=******,dc=******,dc=******" -w "******"  -b "ou=test,dc=gitlab,dc=com" "(cn=my_cn)" memberUid

**Result:**

dn: cn=my_cn,ou=test,dc=gitlab,dc=com memberUid: a memberUid: b memberUid: c

...

gitlab.rb conf:

 gitlab_rails['ldap_enabled'] = true
 gitlab_rails['ldap_servers'] = YAML.load <<-'EOS'
   main: # 'main' is the GitLab 'provider ID' of this LDAP server
     label: 'LDAP'
     host: 'ldap-server'
     port: 389
     uid: 'memberUid'
     bind_dn: 'cn=******,ou=******,dc=******,dc=******'
     password: '****'
     encryption: 'plain' 
     verify_certificates: false
     active_directory: true
     allow_username_or_email_login: true
     block_auto_created_users: false
     base: 'ou=test,dc=gitlab,dc=com'
     user_filter: '(cn=my_cn)'
     attributes:
       username: ['uid', 'userid', 'sAMAccountName']
       email:    ['mail', 'email', 'userPrincipalName']
       name:       'cn'
       first_name: 'givenName'
       last_name:  'sn'
 EOS

Results of GitLab environment info

Expand for output related to GitLab environment info 
(For installations with omnibus-gitlab package run and paste the output of:
`System information
System:         OracleServer 6.5
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.3.5p376
Gem Version:    2.6.13
Bundler Version:1.13.7
Rake Version:   12.0.0
Redis Version:  3.2.5
Git Version:    2.13.5
Sidekiq Version:5.0.4
Go Version:     unknown


GitLab information
Version:        10.0.2-ee
Revision:       f5b3271
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
DB Version:     9.6.3
URL:            http://gitlab.example.com
HTTP Clone URL: http://gitlab.example.com/some-group/some-project.git
SSH Clone URL:  git@gitlab.example.com:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     yes
Using Omniauth: no


GitLab Shell
Version:        5.9.0
Repository storage paths:
  • default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git `)

(For installations from source run and paste the output of: sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

Expand for output related to the GitLab application check 
(For installations with omnibus-gitlab package run and paste the output of:
`Checking GitLab Shell ...


GitLab Shell version >= 5.9.0 ? ... OK (5.9.0)
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: ...
3/1 ... repository is empty
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 ...


Server: ldapmain
LDAP authentication... Success
LDAP users with access to your GitLab server (only showing the first 100 results)
DN: cn=*****,ou=****,dc=***,dc=com        memberUid: a


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? ... skipped (no tmp uploads folder yet)
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: ...
3/1 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.3 ? ... yes (2.3.5)
Git version >= 2.7.3 ? ... yes (2.13.5)
Git user has default SSH configuration? ... yes
Active users: ... 2
Elasticsearch version 5.1 - 5.5? ... skipped (elasticsearch is disabled)


Checking GitLab ... Finished
`)


(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)


(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)

Edited by Ankur