Export Import of Expression Methods

[mkanoor]

This PR allows expressions to be exported and imported. The expression files are stored with the extension .expr in the export/import deck

https://www.pivotaltracker.com/n/projects/1613499/stories/148625717

[tinaafitz]

@mkanoor Could you use the let! for vm1-vm3 here so you don't have to reference them.

[tinaafitz]

@mkanoor Looks good.

[gmcculloug]

Is the expression data being saved in YAML format? If so do we need a new file type or can we just use .yaml?

[mkanoor]

@gmcculloug We use the YAML extension to store method properties file, and we fetch all the methods based on the extension.

[miq-bot]

Checked commits mkanoor/manageiq-automation_engine@0a520fc~...b557ecf with ruby 2.2.6, rubocop 0.47.1, and haml-lint 0.20.0
3 files checked, 1 offense detected

spec/models/miq_ae_yaml_import_export_spec.rb

• ❗ - Line 618, Col 16 - Rails/DynamicFindBy - Use find_by instead of dynamic find_by_class_id_and_name.

[mkanoor]

The yaml file looks like

---
object_type: method
version: 1.0 
object:
  attributes:
    name: ExpTest
    display_name: 
    description: 
    scope: instance
    language: ruby
    location: expression
    data: |
      --- 
      :db: AvailabilityZone
      :expression:
        "=":
          field: AvailabilityZone-href_slug
          value: :user_input
  inputs:
  - field:
      aetype: 
      name: arg1
      display_name: 
      datatype: 
      priority: 1
      owner: 
      default_value: "${/#prefix}"
      substitute: false
      message: create
      visibility: 
      collect: 
      scope: 
      description: 
      condition: 
      on_entry: 
      on_exit: 
      on_error: 
      max_retries: 
      max_time: 

[mkanoor]

Closed in favor of #56