Change superclass for many cops

Let's depend as little as possible on `::RuboCop::Cop::RSpec::Base` as
cop superclass.

Now, only `InferredSpecType` inherits from rubocop-rspec's base class.

Author: bquorning

lib/rubocop/cop/rspec_rails/avoid_setup_hook.rb

@@ -16,7 +16,7 @@ module RSpecRails
       #     allow(foo).to receive(:bar)
       #   end
       #
-      class AvoidSetupHook < ::RuboCop::Cop::RSpec::Base
+      class AvoidSetupHook < ::RuboCop::Cop::Base
         extend AutoCorrector
 
         MSG = 'Use `before` instead of `setup`.'

lib/rubocop/cop/rspec_rails/http_status.rb

@@ -57,7 +57,7 @@ module RSpecRails
       #   it { is_expected.to have_http_status :success }
       #   it { is_expected.to have_http_status :error }
       #
-      class HttpStatus < ::RuboCop::Cop::RSpec::Base
+      class HttpStatus < ::RuboCop::Cop::Base
         extend AutoCorrector
         include ConfigurableEnforcedStyle
         RESTRICT_ON_SEND = %i[have_http_status].freeze

lib/rubocop/cop/rspec_rails/minitest_assertions.rb

@@ -29,7 +29,7 @@ module RSpecRails
       #   expect(a).to be(true)
       #   expect(a).to be(false)
       #
-      class MinitestAssertions < ::RuboCop::Cop::RSpec::Base
+      class MinitestAssertions < ::RuboCop::Cop::Base
         extend AutoCorrector
 
         # :nodoc:

lib/rubocop/cop/rspec_rails/negation_be_valid.rb

@@ -29,7 +29,7 @@ module RSpecRails
       #   # good (with method chain)
       #   expect(foo).to be_invalid.or be_even
       #
-      class NegationBeValid < ::RuboCop::Cop::RSpec::Base
+      class NegationBeValid < ::RuboCop::Cop::Base
         extend AutoCorrector
         include ConfigurableEnforcedStyle
 

lib/rubocop/cop/rspec_rails/travel_around.rb

@@ -23,7 +23,7 @@ module RSpecRails
       #
       #   # good
       #   before { freeze_time }
-      class TravelAround < ::RuboCop::Cop::RSpec::Base
+      class TravelAround < ::RuboCop::Cop::Base
         extend AutoCorrector
 
         MSG = 'Prefer to travel in `before` rather than `around`.'