Description of problem:
According to apidoc for Smart Variables (see https://sat.example.com/apidoc/v2/smart_variables.html) it is possible to specify variable_type while create/update Smart Variable. However, it is not possible to read it back.

> Making HTTP GET request to https://example.com/api/v2/smart_variables/231 with options {'verify': False, 'auth': ('admin', 'changeme'), 'headers': {'content-type': 'application/json'}} and no data.
> Received HTTP 200 response: 
{
    "description":"test",
    "parameter_type":null,
    "default_value":null,
    "hidden_value?":false,
    "hidden_value":"*****",
    "validator_type":null,
    "validator_rule":null,
    "override_value_order":"fqdn\nhostgroup\nos\ndomain",
    "override_values_count":0,
    "merge_overrides":false,
    "merge_default":false,
    "avoid_duplicates":false,
    "puppetclass_id":2,
    "puppetclass_name":"ntp",
    "created_at":"2016-09-14 06:18:00 UTC",
    "updated_at":"2016-09-14 06:21:58 UTC",
    "variable":"𧍾𨨑𢸁嵒𡱓𩳊饄𣲓𨞞㘮𡓤𡾪螀퓔𩕕𡰿𪔧𠽍抑ሙ𪷐𤽭",
    "id":231,
    "override_values":[]
}

Version-Release number of selected component (if applicable):
Satellite 6.2.2 (build 09/12/2016)

How reproducible:
Always

Steps to Reproduce:
1. Create Smart Variable
2. Perform GET request to show smart variable
3. Check if smart_variable[variable_type] is present

Actual results:
smart_variable[variable_type] is missing

Expected results:


Additional info:
Environment info:
>       OS: redhat
>  RELEASE: Red Hat Enterprise Linux Server release 7.2 (Maipo)
>  FOREMAN: 1.11.0.53
>     RUBY: ruby 2.0.0p598 (2014-11-13) [x86_64-linux]
>   PUPPET: 3.8.6
>  DENIALS: 0

Installed packages:
* candlepin-0.9.54.7-1.el7.noarch
* candlepin-selinux-0.9.54.7-1.el7.noarch
* foreman-1.11.0.53-1.el7sat.noarch
* foreman-compute-1.11.0.53-1.el7sat.noarch
* foreman-debug-1.11.0.53-1.el7sat.noarch
* foreman-discovery-image-3.1.1-17.el7sat.noarch
* foreman-ec2-1.11.0.53-1.el7sat.noarch
* foreman-gce-1.11.0.53-1.el7sat.noarch
* foreman-installer-1.11.0.10-1.el7sat.noarch
* foreman-installer-katello-3.0.0.57-1.el7sat.noarch
* foreman-libvirt-1.11.0.53-1.el7sat.noarch
* foreman-openstack-1.11.0.53-1.el7sat.noarch
* foreman-ovirt-1.11.0.53-1.el7sat.noarch
* foreman-postgresql-1.11.0.53-1.el7sat.noarch
* foreman-proxy-1.11.0.6-1.el7sat.noarch
* foreman-rackspace-1.11.0.53-1.el7sat.noarch
* foreman-selinux-1.11.0.2-1.el7sat.noarch
* foreman-vmware-1.11.0.53-1.el7sat.noarch
* katello-3.0.0-12.el7sat.noarch
* katello-certs-tools-2.4.0-1.el7sat.noarch
* katello-client-bootstrap-1.1.0-2.el7sat.noarch
* katello-common-3.0.0-12.el7sat.noarch
* katello-debug-3.0.0-12.el7sat.noarch
* katello-default-ca-1.0-1.noarch
* katello-installer-base-3.0.0.57-1.el7sat.noarch
* katello-selinux-3.0.1.2-1.el7sat.noarch
* katello-server-ca-1.0-1.noarch
* katello-service-3.0.0-12.el7sat.noarch
* openldap-2.4.40-9.el7_2.x86_64
* pulp-client-1.0-1.noarch
* pulp-docker-plugins-2.0.1.1-1.el7sat.noarch
* pulp-katello-1.0.1-1.el7sat.noarch
* pulp-ostree-plugins-1.1.1-2.el7sat.noarch
* pulp-puppet-plugins-2.8.3.3-1.el7sat.noarch
* pulp-puppet-tools-2.8.3.3-1.el7sat.noarch
* pulp-rpm-plugins-2.8.3.5-1.el7sat.noarch
* pulp-selinux-2.8.3.4-1.el7sat.noarch
* pulp-server-2.8.3.4-1.el7sat.noarch
* python-ldap-2.4.15-2.el7.x86_64
* tfm-rubygem-ldap_fluff-0.4.3-1.el7sat.noarch
* tfm-rubygem-net-ldap-0.13.0-1.el7sat.noarch