Validate name uniqueness for Transformation Plans

[agrare]

Add a unique name validation, scoped to the tenant, for
ServiceTemplateTransformationPlans.

ManageIQ/manageiq-v2v#451

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1567225

[agrare]

@bzwei do you know why it is failing to have the validation on the subclass? This works from a rails console but fails on the spec test, granted I was calling just .create from rails c not create_catalog_item

[bzwei]

@agrare our factories for service_template models are all nameless because the base class does not have uniqueness requirement. You will need to feed one name for service_template_transformation_plan

[agrare]

@bzwei oh actually I wasn't even talking about those spec failures, this morning when I tried adding a spec test it passed and didn't raise an exception.
I updated the factory to add a sequenced name and now it is raising an appropriate error.

PTAL

[miq-bot]

Checked commit agrare@fb695d0 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
3 files checked, 0 offenses detected
Everything looks fine. 🍰

[agrare]

Thanks @bzwei

[simaishi]

Gaprindashvili backport details:

$ git log -1
commit 80edeaa410ec566b4b0d13bac42999c363833e1c
Author: Greg McCullough <gmccullo@redhat.com>
Date:   Mon Jul 9 16:09:31 2018 -0400

    Merge pull request #17677 from agrare/validate_name_is_unique_transformation_plan
    
    Validate name uniqueness for Transformation Plans
    (cherry picked from commit 6586413443d504a0a2ae5fa4a30072e0145d57b3)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1608768