Add a check task

This forms a combination of all check tasks which makes it easy to run
it locally or in CI. The release_checks task is also modified to use it
instead.

lib/puppetlabs_spec_helper/rake_tasks.rb

@@ -301,10 +301,7 @@
   else
     Rake::Task[:spec].invoke
   end
-  Rake::Task['check:symlinks'].invoke
-  Rake::Task['check:test_file'].invoke
-  Rake::Task['check:dot_underscore'].invoke
-  Rake::Task['check:git_ignore'].invoke
+  Rake::Task[:check].invoke
 end
 
 namespace :check do
@@ -345,6 +342,9 @@
   end
 end
 
+desc 'Run static pre release checks'
+task check: ['check:symlinks', 'check:test_file', 'check:dot_underscore', 'check:git_ignore']
+
 desc 'Display the list of available rake tasks'
 task :help do
   system('rake -T')