Description of problem:
When assigning 'default_value' or matcher 'value' that has different type than 'variable_type' and is not a string, null (for 'default_value') or actual value (for matcher 'value') is assigned instead of raising error.

For example,
1) Assigning default value using 'nailgun' syntax and HTTP response:
In this case error was not raised and default_value was set to null.

1.1) Create smart variable with integer variable type
> smart_variable = entities.SmartVariable(
>     default_value=50,
>     variable_type='integer'
> ).create()

1.2) Assign list of strings as default_value
> smart_variable.default_value = ['a', 'b']
> smart_variable.update(['default_value'])

1.3) Actual HTTP request and response (some parts are skipped)
> Making HTTP PUT request to https://example.com.com/api/v2/smart_variables/158 with ... 'headers':{'content-type': 'application/json'}} and data {"default_value": ["a", "b"]}.
> Received HTTP 200 response: {"description":null,"parameter_type":"integer","default_value":null,"validator_type":null,"validator_rule":null,"variable":"獮翤𨩔","id":158,"override_values":[]}

2) Assigning matcher value using 'nailgun' syntax and HTTP response
In this case error was not raised but matcher value was set to different type value.

2.1) Create smart variable
> smart_variable = entities.SmartVariable(
>     default_value=False,
>     variable_type='boolean'
> ).create()

2.2) Create matcher
> entities.OverrideValue(
>    match='domain=test.com',
>    value=50,
> ).create()

2.3) Actual HTTP request and response (some parts are skipped)
> Making HTTP POST request to https://example.com/api/v2/smart_variables/160/override_values with ... 'headers': {'content-type': 'application/json'}} and data {"smart_variable_id": 160, "value": 50, "match": "domain=test.com"}.
> Received HTTP 201 response: {... "id":37,"match":"domain=test.com","value":50,"use_puppet_default":false}

3) However, if assigned value is a string, validation works as expected:
> entities.SmartVariable(variable_type='boolean', ...).create()
> entities.OverrideValue(value="test", ...).create()
> Received HTTP 500 response: { "error": {"message":"Validation failed: Value is invalid boolean"}

4) Other type/value combinations that not caused errors:
variable_type='real', value=['a', 'b']
variable_type='array', value=True 

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


How reproducible:
Always

Steps to Reproduce:
1. Create Smart Variable via API, set default_value and variable_type to any valid values, e.g. 50 and 'integer'
2. Update Smart Variable with any new default_value that has different than 'variable_type' and is not a string, e.g. True
3. Read again that Smart Variable

Actual results:
Value is 'null' for 'default_value' or has a different type for matcher 'value'

Expected results:
1. HTTP 500 error with message "Validation failed: Value is invalid"
2. 'default_value' or matcher 'value' should not be updated.

Additional info:
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