Description of problem:
Host information is not returned when issuing an HTTP GET request to api/v2/auth_source_ldaps/:id. This does not make sense:

* The "host" parameter must be specified when creating an auth source ldap. If this parameter is necessary when creating an auth source ldap, shouldn't it be possible to read back that information later?
* The API documentation of theforeman.org provides an example of issuing an HTTP GET to api/v2/auth_source_ldaps/:id. The "host" parameter is returned.

Version-Release number of selected component (if applicable):
I tested this issue against qe-sat6-rhel65, which is running Satellite 6.0.4. The following software is installed on that machine:

* apr-util-ldap-1.3.9-3.el6_0.1.x86_64
* candlepin-0.9.23-1.el6_5.noarch
* candlepin-common-1.0.1-1.el6_5.noarch
* candlepin-scl-1-5.el6_4.noarch
* candlepin-scl-quartz-2.1.5-5.el6_4.noarch
* candlepin-scl-rhino-1.7R3-1.el6_4.noarch
* candlepin-scl-runtime-1-5.el6_4.noarch
* candlepin-selinux-0.9.23-1.el6_5.noarch
* candlepin-tomcat6-0.9.23-1.el6_5.noarch
* elasticsearch-0.90.10-6.el6sat.noarch
* foreman-1.6.0.44-1.el6sat.noarch
* foreman-compute-1.6.0.44-1.el6sat.noarch
* foreman-gce-1.6.0.44-1.el6sat.noarch
* foreman-libvirt-1.6.0.44-1.el6sat.noarch
* foreman-ovirt-1.6.0.44-1.el6sat.noarch
* foreman-postgresql-1.6.0.44-1.el6sat.noarch
* foreman-proxy-1.6.0.30-1.el6sat.noarch
* foreman-selinux-1.6.0.14-1.el6sat.noarch
* foreman-vmware-1.6.0.44-1.el6sat.noarch
* katello-1.5.0-30.el6sat.noarch
* katello-certs-tools-1.5.6-1.el6sat.noarch
* katello-default-ca-1.0-1.noarch
* katello-installer-0.0.64-1.el6sat.noarch
* katello-server-ca-1.0-1.noarch
* openldap-2.4.23-32.el6_4.1.x86_64
* pulp-katello-0.3-4.el6sat.noarch
* pulp-nodes-common-2.4.1-0.7.beta.el6sat.noarch
* pulp-nodes-parent-2.4.1-0.7.beta.el6sat.noarch
* pulp-puppet-plugins-2.4.1-0.7.beta.el6sat.noarch
* pulp-puppet-tools-2.4.1-0.7.beta.el6sat.noarch
* pulp-rpm-plugins-2.4.1-0.7.beta.el6sat.noarch
* pulp-selinux-2.4.1-0.7.beta.el6sat.noarch
* pulp-server-2.4.1-0.7.beta.el6sat.noarch
* python-ldap-2.3.10-1.el6.x86_64
* ruby193-rubygem-net-ldap-0.3.1-3.el6sat.noarch
* ruby193-rubygem-runcible-1.1.0-2.el6sat.noarc

How reproducible:
Always.

Steps to Reproduce:
1. Issue an HTTP GET request to api/v2/auth_source_ldaps/:id.
2. Examine the response. Look for a "host" parameter.

Actual results:
The following parameters are returned when reading an auth source LDAP:

    [
        u'account',
        u'name',
        u'attr_firstname',
        u'attr_lastname',
        u'attr_login',
        u'attr_mail',
        u'attr_photo',
        u'base_dn',
        u'created_at',
        u'id',
        u'ldap_filter',
        u'onthefly_register',
        u'port',
        u'tls',
        u'type',
        u'updated_at',
    ]

Expected results:
Same as above, but with 'host' in the list too.


Additional info:
n/a