Add rubocop-rspec_rails and get rubocop run to green

In rubocop/rubocop-rspec#1848 rubocop-rspec extracted
some cops to separate gems, and because we referenced one of them in our
rubocop_todo.yml the whole rubocop process wouldn't run because it doesn't like
config for cops it doesn't know about. We introducing the missing gem,
`rubocop-rspec_rails`, and fix the name in the config to let us run rubocop
again.

There is one infraction that exists in the source so we fix that to get us to a
green rubocop run.

.rubocop.yml

@@ -1,6 +1,7 @@
 require:
   - rubocop-rails
   - rubocop-rspec
+  - rubocop-rspec_rails
   - rubocop-performance
 
 inherit_from: .rubocop_todo.yml

.rubocop_todo.yml

@@ -1155,7 +1155,7 @@ RSpec/PredicateMatcher:
 # Offense count: 1
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: Inferences.
-RSpec/Rails/InferredSpecType:
+RSpecRails/InferredSpecType:
   Exclude:
     - 'spec/controllers/pets_controller_spec.rb'
 

apipie-rails.gemspec

@@ -38,6 +38,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rubocop-rails'
   s.add_development_dependency 'rubocop-rspec'
   s.add_development_dependency 'rubocop-performance'
+  s.add_development_dependency 'rubocop-rspec_rails'
   s.add_development_dependency "simplecov"
   s.add_development_dependency "sqlite3"
 end

spec/lib/swagger/swagger_dsl_spec.rb

@@ -283,7 +283,7 @@ def have_field?(field, expected_name, breadcrumb)
         expect(schema).to have_field(:pet_id, 'number', {:description => 'id of pet'})
         expect(schema).to have_field(:pet_name, 'string', {:description => 'Name of pet', :required => false})
         expect(schema).to have_field(:animal_type, 'string', {:description => 'Type of pet', :enum => %w[dog cat iguana kangaroo]})
-        expect(schema).not_to have_field(:partial_match_allowed, 'boolean', {:required => false}) # rubocop:disable Capybara/NegationMatcher
+        expect(schema).not_to have_field(:partial_match_allowed, 'boolean', {:required => false})
       end
 
       it "creates a swagger definition with all input parameters" do