(bug) - Remove build:pdk rake task

This updates the build rake tasks to build modules with modulebuilder
as oppose to pdk::module::build. This class was removed in pdk 3.3.0, and as such we
should update to use the recommended tooling for the job
puppet-modulebuilder.

This change is backwards-incompatible as it includes the deletion of the
build:pdk rake task.

lib/puppetlabs_spec_helper/rake_tasks.rb

@@ -123,26 +123,11 @@
 
 desc 'Build puppet module package'
 task :build do
-  Rake::Task['build:pdk'].invoke
-end
-
-namespace :build do
-  desc 'Build Puppet module with PDK'
-  task :pdk do
-    require 'pdk/util'
-    require 'pdk/module/build'
-
-    path = PDK::Module::Build.invoke(force: true, 'target-dir': File.join(Dir.pwd, 'pkg'))
-    puts "Module built: #{path}"
-  rescue LoadError
-    _ = `pdk --version`
-    unless $CHILD_STATUS.success?
-      warn 'Unable to build module. Please install PDK or add the `pdk` gem to your Gemfile.'
-      abort
-    end
-
-    system('pdk build --force')
-  end
+  require 'puppet/modulebuilder'
+  target_dir = File.join(Dir.pwd, 'pkg')
+  builder = Puppet::Modulebuilder::Builder.new(Dir.pwd)
+  package = builder.build
+  puts "Module built: #{package}"
 end
 
 desc 'Clean a built module package'

puppetlabs_spec_helper.gemspec

@@ -31,6 +31,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'mocha', '>= 1.0', '< 3'
   spec.add_runtime_dependency 'pathspec', '>= 0.2', '< 3'
   spec.add_runtime_dependency 'puppet-lint', '~> 4.0'
+  spec.add_runtime_dependency 'puppet-modulebuilder', '~> 1.0'
   spec.add_runtime_dependency 'puppet-syntax', '~> 4.1', '>= 4.1.1'
   spec.add_runtime_dependency 'rspec-github', '~> 2.0'
   spec.add_runtime_dependency 'rspec-puppet', '~> 5.0'