config: adjust rack timeout setup
config: adjust rack timeout setup

In newer versions of Rack, this method of setting the timeout is
obsolete. I stole the fix here from:

  https://github.com/sharpstone/rack-timeout/issues/130#issuecomment-391667182

Mokolea/git-scm.com,mosoft521/gitscm-next,git/git-scm.com,mosoft521/gitscm-next,git/git-scm.com,mosoft521/gitscm-next,git/git-scm.com,Mokolea/git-scm.com,Mokolea/git-scm.com,mosoft521/gitscm-next,Mokolea/git-scm.com,git/git-scm.com