test_process.rb: handshake

* test/ruby/test_process.rb: handshake by pipe instead of sleep.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
envutil.rb: reduce wait

* test/ruby/envutil.rb (EnvUtil.diagnostic_reports): reduce watching
  interval.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44219 b2dd03c8-39d4-4d8f-98ff-823fe69b080e