Enable property checking customization in test file

This PR provides supports for customization of property checking in test file. We provide the features of

Excluding the resource reference property checking automatically.
Supporting property_check_includes field to specify the properties users want to include from all the properties listed in property filed.
Supporting property_check_excludes field to specify the properties users want to exclude.
When both are specified, we use property_check_includes rather than property_check_excludes.

The customization rules in the basic.yaml or complete.yaml are

The two filed are designed to be array of strings.
Using the terraform state representation to specify the property.
Using prop* to represent all the sub-properties inside the prop.

Here is an example. And this results in checking only all the representations with prefix custom_rules.1 in test file.

--- !ruby/object:Provider::Azure::Example
resource: azurerm_web_application_firewall_policy
prerequisites:
  - !ruby/object:Provider::Azure::ExampleReference
    product: resourcegroup
    example: basic
properties:
  name: "<%= get_resource_name('ApplicationGatewayWebApplicationFirewallPolicies', 'wafpolicy') -%>"
  resource_group_name: ${azurerm_resource_group.<%= resource_id_hint -%>.name}
  location: ${azurerm_resource_group.<%= resource_id_hint -%>.location}
  custom_rules:
    - name: Rule1
      priority: 1
      rule_type: MatchRule
      match_conditions:
        - match_variables:
            - variable_name: RemoteAddr
          operator: IPMatch
          negation_conditon: false
          match_values: [192.168.1.0/24, 10.0.0.0/24]
      action: Block
    - name: Rule2
      priority: 2
      rule_type: MatchRule
      match_conditions:
        - match_variables:
            - variable_name: RemoteAddr
          operator: IPMatch
          negation_conditon: false
          match_values: [192.168.1.0/24]
        - match_variables:
            - variable_name: RequestHeaders
              selector: UserAgent
          operator: Contains
          negation_conditon: false
          match_values: [Windows]
      action: Block
property_check_excludes:
  - custom_rules.#
  - custom_rules.0.*

VSChina / magic-modules

Enable property checking customization in test file #40