test_rinda.rb: sleep to timeout

* test/rinda/test_rinda.rb (test_do_reply): sleep instead of busy loop.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44622 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_rinda.rb: timeout

* test/rinda/test_rinda.rb (test_do_reply): stop if blocking
  including TupleSpace#write and RingServer#do_reply.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44623 b2dd03c8-39d4-4d8f-98ff-823fe69b080e