[DRE-maint] Bug#984713: Try enabling some tests currently disabled

[Pirate Praveen]

Package: puma
Version: 5.2.2-1
Severity: wishlist

Currently some failing tests are disabled via debian/ruby-tests.rake

 t.test_files = FileList['test/**/*_test.rb'] + 
FileList['test/**/test_*.rb'] - 
FileList['test/test_puma_server_ssl.rb','test/test_integration_systemd.rb','test/test_integration_cluster.rb','test/test_integration_pumactl.rb','test/test_worker_gem_independence.rb','test/test_preserve_bundler_env.rb']

It'd be nice to see if some of these can be enabled.

test/test_integration_systemd.rb require packaging sd_notify gem.