Description of problem:

Auth - MIQLDAP - AD, FreeIPA, OpenLDAP - No valid bind credentials when not using "get groups from LDAP" When you don't use "get groups from LDAP" and you set a default group, User can't log in b/c there are no bind credentials that normally get setup in 
get groups from LDAP" User's creds should be used to bind. User has not logged in, and user is not in UI or custom group, but default group should account for that. Even if user is added to ui, and given a group or custom group binding still fails


Version-Release number of selected component (if applicable):
5.8.0.11-beta2, I suspect 5.6 and 5.7 as well since I never tested this scenario

How reproducible:


Steps to Reproduce:
1. Configure MIQLDAP LDAP/LDAPS
2. Do not check "get greps from ldap"
3. Specify a default group
4. Try logging with a user --> Login fails
5. Add the user to the webUI and assign a group --> Login still fails

Actual results:
Login fails

Expected results:

Login should succeed. 

Additional info:

It appears what is happening is authentication is succcessful as far as validating the user/password combination.  But the user record cannot be created b/c there is no valid bind user as we normally specify a bind user when we use "get groups from ldap"  In this case we should just bind as the user themselves.

[----] I, [2017-04-25T11:27:26.839452 #2947:c319b4]  INFO -- : <AuditSuccess> MIQ(Authenticator.authenticate) userid: [ldapuser2] - User ui
d=ldapuser2,cn=users,cn=accounts,dc=cfme,dc=lab,dc=eng,dc=rdu2,dc=redhat,dc=com successfully validated by LDAP
[----] I, [2017-04-25T11:27:26.841788 #2947:c319b4]  INFO -- : MIQ(Authenticator::Ldap#find_external_identity) Bind DN: []
[----] I, [2017-04-25T11:27:26.841939 #2947:c319b4]  INFO -- : MIQ(Authenticator::Ldap#find_external_identity)  User FQDN: [uid=ldapuser2,c
n=users,cn=accounts,dc=cfme,dc=lab,dc=eng,dc=rdu2,dc=redhat,dc=com]
[----] I, [2017-04-25T11:27:26.842575 #2947:c319b4]  INFO -- : MIQ(MiqLdap#initialize) Server Settings: {:basedn=>nil, :bind_dn=>nil, :bind
_pwd=>nil, :bind_timeout=>30, :follow_referrals=>false, :get_direct_groups=>true, :group_memberships_max_depth=>2, :ldaphost=>["cfme-rhel7-
ipa.cfme.lab.eng.rdu2.redhat.com"], :ldapport=>"636", :mode=>"ldaps", :search_timeout=>30, :user_suffix=>"cn=users,cn=accounts,dc=cfme,dc=l
ab,dc=eng,dc=rdu2,dc=redhat,dc=com", :user_type=>"dn-uid", :amazon_key=>nil, :amazon_secret=>nil, :default_group_for_users=>"EvmGroup-user"
, :local_login_disabled=>false, :saml_enabled=>false, :sso_enabled=>false, :user_proxies=>[{}], :httpd_role=>false, :amazon_role=>false, :l
dap_role=>false}
[----] I, [2017-04-25T11:27:26.844711 #2947:c319b4]  INFO -- : MiqLdap.connection: Resolved host [cfme-rhel7-ipa.cfme.lab.eng.rdu2.redhat.c
om] has these IP Address: ["10.8.58.41"]
[----] I, [2017-04-25T11:27:26.844793 #2947:c319b4]  INFO -- : MiqLdap.connection: Connecting to IP Address [10.8.58.41]
[----] I, [2017-04-25T11:27:26.845909 #2947:c319b4]  INFO -- : options: {:auth=>{:basedn=>nil, :bind_dn=>nil, :bind_pwd=>nil, :bind_timeout
=>30, :follow_referrals=>false, :get_direct_groups=>true, :group_memberships_max_depth=>2, :ldaphost=>["cfme-rhel7-ipa.cfme.lab.eng.rdu2.re
dhat.com"], :ldapport=>"636", :mode=>"ldaps", :search_timeout=>30, :user_suffix=>"cn=users,cn=accounts,dc=cfme,dc=lab,dc=eng,dc=rdu2,dc=red
hat,dc=com", :user_type=>"dn-uid", :amazon_key=>nil, :amazon_secret=>nil, :default_group_for_users=>"EvmGroup-user", :local_login_disabled=
>false, :saml_enabled=>false, :sso_enabled=>false, :user_proxies=>[{}], :httpd_role=>false, :amazon_role=>false, :ldap_role=>false}, :host=
>"10.8.58.41", :port=>"636", :encryption=>{:method=>:simple_tls}}
[----] I, [2017-04-25T11:27:26.846057 #2947:c319b4]  INFO -- : MIQ(MiqLdap#bind) Binding to LDAP: Host: [10.8.58.41], User: []...
[----] E, [2017-04-25T11:27:26.859144 #2947:c319b4] ERROR -- : MIQ(MiqLdap#bind) Binding to LDAP: Host: [10.8.58.41], User: [], 'Invalid bi
nding information'
[----] E, [2017-04-25T11:27:26.865275 #2947:c319b4] ERROR -- : [NoMethodError]: undefined method `get_user_object' for nil:NilClass  Method
:[rescue in authenticate]
[----] E, [2017-04-25T11:27:26.865564 #2947:c319b4] ERROR -- : /var/www/miq/vmdb/app/models/authenticator/ldap.rb:87:in `find_external_iden
tity'
/var/www/miq/vmdb/app/models/authenticator/ldap.rb:94:in `userprincipal_for'
/var/www/miq/vmdb/app/models/authenticator/ldap.rb:34:in `find_or_create_by_ldap'
/var/www/miq/vmdb/app/models/authenticator/ldap.rb:9:in `lookup_by_identity'
/var/www/miq/vmdb/app/models/authenticator.rb:68:in `authenticate'
/var/www/miq/vmdb/app/models/user.rb:155:in `authenticate'
/var/www/miq/vmdb/app/controllers/api/base_controller/authentication.rb:20:in `block in require_api_user_or_token'
/opt/rh/cfme-gemset/gems/actionpack-5.0.2/lib/action_controller/metal/http_authentication.rb:97:in `authenticate'
/opt/rh/cfme-gemset/gems/actionpack-5.0.2/lib/action_controller/metal/http_authentication.rb:87:in `authenticate_with_http_basic'
/var/www/miq/vmdb/app/controllers/api/base_controller/authentication.rb:20:in `require_api_user_or_token'