Remove cucumber monkey patch translating steps:

It was initially added to allow reuse of aruba cucumber steps, using
`must' instead of `should'. This is creating more harm than good, hence
we remove it and implements all missing steps, using aruba API.

features/support/env.rb

@@ -1,18 +1,2 @@
-module Cucumber
-  class Runtime
-    alias :old_step_match :step_match
-
-    def step_match(step_name, name_to_report = nil)
-      if step_name.include? ' must '
-        name_to_report = step_name.dup
-        step_name.gsub! ' must ', ' should '
-      end
-
-      old_step_match(step_name, name_to_report)
-    end
-  end
-end
-
 require 'aruba/cucumber'
-
 require 'cucumber/sshd/cucumber'