envutil.rb: keyword arguments

* test/ruby/envutil.rb (invoke_ruby, assert_normal_exit),
  (assert_in_out_err, assert_ruby_status, assert_separately): use
  keyword arguments so that optional parameters can be omitted.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41466 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
envutil.rb: refine message

* test/ruby/envutil.rb (invoke_ruby): refine message and skip
  innermost backtrace on timeout.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41467 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_fiber.rb: longer timeout

* test/ruby/test_fiber.rb (test_many_fibers): make timeout longer.
  10sec is not sufficient.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41468 b2dd03c8-39d4-4d8f-98ff-823fe69b080e