Move rspec cli handling logic into Specs::Runner

Here we convert Specs::Runner#rspec to use keyword arguments[1] and pass
named parameters rather than a pre-processed array of cli switches.
This allows parameter to cli logic to live just in Specs::Runner.

[1] https://robots.thoughtbot.com/ruby-2-keyword-arguments

qa/qa/scenario/entrypoint.rb

@@ -9,8 +9,8 @@ module QA
         @tags = tags
       end
 
-      def self.tag_switches
-        @tags.map { |tag| ['-t', tag.to_s] }
+      def self.get_tags
+        @tags
       end
 
       def perform(address, *files)
@@ -24,7 +24,11 @@ module QA
         Runtime::Release.perform_before_hooks
 
         Specs::Runner.perform do |specs|
-          specs.rspec('--tty', self.class.tag_switches, files.any? ? files : 'qa/specs/features')
+          specs.rspec(
+            tty: true,
+            tags: self.class.get_tags,
+            files: files.any? ? files : 'qa/specs/features'
+          )
         end
       end
     end

qa/qa/specs/runner.rb

@@ -5,7 +5,14 @@ module QA
     class Runner
       include Scenario::Actable
 
-      def rspec(*args)
+      def rspec(tty: false, tags: [], files: ['qa/specs/features'])
+        args = []
+        args << '--tty' if tty
+        tags.to_a.each do |tag|
+          args << ['-t', tag.to_s]
+        end
+        args << files
+
         RSpec::Core::Runner.run(args.flatten, $stderr, $stdout).tap do |status|
           abort if status.nonzero?
         end