merge revision(s) 55008: [Backport #12342]
* lib/drb/timeridconv.rb: don't use keeper thread. [Bug #12342] * test/drb/ut_timerholder.rb: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@55929 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 55008: [Backport #12342]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@55929 b2dd03c8-39d4-4d8f-98ff-823fe69b080e