Remove gem.rake from 3.0.x

gem.rake is no longer used in 3.0.x because of the new workflow using the
packaging repo. It was still required in 2.7.x because 2.7.x still shipped with
sbin files and the gem.rake did some magic with moving sbin to bin. This commit
removes the rake task.

tasks/rake/gem.rake

@@ -1,62 +0,0 @@
-require 'fileutils'
-require 'puppet/version'
-
-GEM_FILES = FileList[
-    '[A-Z]*',
-    'install.rb',
-    'bin/**/*',
-    'lib/**/*',
-    'conf/**/*',
-    'man/**/*',
-    'examples/**/*',
-    'ext/**/*',
-    'tasks/**/*',
-    'test/**/*',
-    'spec/**/*'
-]
-
-EXECUTABLES = FileList[
-    'bin/**/*',
-    'sbin/**/*'
-]
-
-SBIN = Dir.glob("sbin/*")
-GEMVERSION = Puppet.version.gsub('-','.')
-
-spec = Gem::Specification.new do |spec|
-    spec.platform = Gem::Platform::RUBY
-    spec.name = 'puppet'
-    spec.files = GEM_FILES.to_a
-    spec.executables = EXECUTABLES.gsub(/sbin\/|bin\//, '').to_a
-    spec.version = GEMVERSION
-    spec.add_dependency('facter', '~> 1.5')
-    spec.summary = 'Puppet, an automated configuration management tool'
-    spec.description = 'Puppet, an automated configuration management tool'
-    spec.author = 'Puppet Labs'
-    spec.email = 'puppet@puppetlabs.com'
-    spec.homepage = 'http://puppetlabs.com'
-    spec.rubyforge_project = 'puppet'
-    spec.has_rdoc = true
-    spec.rdoc_options <<
-        '--title' <<  'Puppet - Configuration Management' <<
-        '--main' << 'README' <<
-        '--line-numbers'
-end
-
-desc "Prepare binaries for gem creation"
-task :prepare_gem do
-    SBIN.each do |f|
-      FileUtils.copy(f,"bin")
-    end
-end
-
-desc "Create the gem"
-task :create_gem => :prepare_gem do
-    Dir.mkdir("pkg") rescue nil
-    Gem::Builder.new(spec).build
-    FileUtils.move("puppet-#{GEMVERSION}.gem", "pkg")
-    SBIN.each do |f|
-       fn = f.gsub(/sbin\/(.*)/, '\1')
-       FileUtils.rm_r "bin/" + fn
-    end
-end