Stop sharding --jit-wait testing

by just randomizing test order.

The original motivation to shard --jit-wait tests was forcing to test
major parts of code without actually stopping to test MJIT after
TracePoint enablement. But it tends to increase the test time because we
often compile the same thing in different shards.

I made this decision because we seem to hit 1.5h timeout of Wercker
these days, and Wercker is really bad at handling timeout (it does not
report timeout as failure, but just keeps it "pending" state)
https://app.wercker.com/ruby/ruby/runs/mjit-test2/5c78f15cc9e725000805b86c?step=5c79031d6c1e2c0008ac41c3

By randomizing this, we could test things randomly. The downside of this
approach is that we may not be able to find a specific commit that
caused a future failure by having TracePoint in a very early phase.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67158 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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