Extract cucumber env and steps to ease code reuse

producer extensions like producer-rails must not reimplement all the
testing infrastructure, this extraction allows to setup everything with
just one require call in cucumber env:

    require 'producer/core/testing/cucumber'

features/steps/etc_steps.rb

@@ -1,3 +0,0 @@
-Then /^the output must contain my current login name$/ do
-  assert_partial_output Etc.getlogin, all_output
-end

features/steps/execution_steps.rb

@@ -1,3 +0,0 @@
-Then /^the exit status must be (\d+)$/ do |exit_status|
-  assert_exit_status exit_status.to_i
-end

features/steps/output_steps.rb

@@ -1,35 +0,0 @@
-Then /^the output must match \/([^\/]+)\/$/ do |pattern|
-  assert_matching_output pattern, all_output
-end
-
-Then /^the output must contain "([^"]+)"$/ do |content|
-  assert_partial_output content, all_output
-end
-
-Then /^the output must contain:$/ do |content|
-  assert_partial_output content, all_output
-end
-
-Then /^the output must not contain "([^"]+)"$/ do |content|
-  assert_no_partial_output content, all_output
-end
-
-Then /^the output must contain exactly "([^"]+)"$/ do |content|
-  assert_exact_output content, all_output
-end
-
-Then /^the output must contain exactly:$/ do |content|
-  assert_exact_output content, all_output
-end
-
-Then /^the error output must contain exactly "([^"]+)"$/ do |content|
-  assert_exact_output content, all_stderr
-end
-
-Then /^the output must contain ruby lib directory$/ do
-  assert_partial_output RbConfig::CONFIG['rubylibdir'], all_output
-end
-
-Then /^the output must not contain ruby lib directory$/ do
-  assert_no_partial_output RbConfig::CONFIG['rubylibdir'], all_output
-end

features/steps/recipe_steps.rb

@@ -1,70 +0,0 @@
-def run_recipe(remote: false, options: nil, check: false, rargv: nil)
-  command = %w[producer recipe.rb]
-  case remote
-  when :unknown then command += %w[-t unknown_host.test]
-  when true     then command += %w[-t some_host.test]
-  end
-  command << options if options
-  command << ['--', *rargv] if rargv
-
-  run_simple command.join(' '), false
-
-  assert_exit_status 0 if check
-  assert_matching_output '\ASocketError', all_output if remote == :unknown
-end
-
-Given /^a recipe with:$/ do |recipe_body|
-  write_file 'recipe.rb', recipe_body
-end
-
-Given /^a recipe with an error$/ do
-  write_file 'recipe.rb', "fail 'some error'\n"
-end
-
-Given /^a recipe using a remote$/ do
-  write_file 'recipe.rb', "task(:some_task) { sh 'echo hello' }\n"
-end
-
-Given /^a recipe named "([^"]+)" with:$/ do |recipe_path, recipe_body|
-  write_file recipe_path, recipe_body
-end
-
-When /^I execute the recipe$/ do
-  run_recipe
-end
-
-When /^I execute the recipe on remote target$/ do
-  run_recipe remote: true
-end
-
-When /^I execute the recipe on unknown remote target$/ do
-  run_recipe remote: :unknown
-end
-
-When /^I execute the recipe with options? (-.+)$/ do |options|
-  run_recipe options: options
-end
-
-When /^I execute the recipe on unknown remote target with options? (-.+)$/ do |options|
-  run_recipe remote: :unknown, options: options
-end
-
-When /^I successfully execute the recipe$/ do
-  run_recipe check: true
-end
-
-When /^I successfully execute the recipe on remote target$/ do
-  run_recipe remote: true, check: true
-end
-
-When /^I successfully execute the recipe with option? (-.+)$/ do |options|
-  run_recipe options: options, check: true
-end
-
-When /^I successfully execute the recipe with arguments "([^"]+)"$/ do |rargv|
-  run_recipe rargv: rargv, check: true
-end
-
-When /^I execute the recipe interactively$/ do
-  run_interactive 'producer recipe.rb'
-end

features/steps/remote_steps.rb

@@ -1,41 +0,0 @@
-def stat_mode(path)
-  in_current_dir do
-    ('%o' % [File::Stat.new(path).mode])[-4, 4]
-  end
-end
-
-Given /^a remote directory named "([^"]+)"$/ do |path|
-  create_dir path
-end
-
-Given /^a remote file named "([^"]+)"$/ do |file_name|
-  write_file file_name, ''
-end
-
-Given /^a remote file named "([^"]+)" with "([^"]+)"$/ do |file_name, content|
-  write_file file_name, content
-end
-
-Then /^the remote directory "([^"]+)" must exist$/ do |path|
-  check_directory_presence [path], true
-end
-
-Then /^the remote file "([^"]+)" must contain "([^"]+)"$/ do |path, content|
-  check_file_content path, content, true
-end
-
-Then /^the remote file "([^"]+)" must contain exactly "([^"]+)"$/ do |path, content|
-  check_file_content path, content
-end
-
-Then /^the remote file "([^"]+)" must match \/([^\/]+)\/$/ do |path, pattern|
-  check_file_content path, /#{pattern}/, true
-end
-
-Then /^the remote file "([^"]+)" must have (\d+) mode$/ do |path, mode|
-  expect(stat_mode path).to eq mode
-end
-
-Then /^the remote directory "([^"]+)" must have (\d+) mode$/ do |path, mode|
-  expect(stat_mode path).to eq mode
-end

features/steps/ssh_steps.rb

@@ -1,3 +0,0 @@
-Given /^an SSH config with:$/ do |config|
-  write_file '.ssh/config', config
-end