csl: Fix OSS builds
csl: Fix OSS builds

Problem
OSS build is still broken by the following reasons:

1. My recent patch of `bin/travisci` had a typo under Scrooge (`.sbt` instead `./sbt`). Sorry.
2. Sbt runs the tests in the order that differers from pants. And somehow, the order matters
   for `fiangle-http` due to some tests that use "addr=lable" address format. The reason for
   this is a global mutable state per `ServerRegistry` that is shared acroos Finagle instance
   and _overrides_ the server label.
3. Finagle uses an old version of scrooge-sbt-plugin that had [a bug dealing with hierarchical
   thrift structures][1].

Solution

1. Fix typo in `scrooge/bin/travisci`.
2. Do not use `addr=label` format as address in tests to avoid using `ServerRegistry`.
3. Update Scrooge to the [most recent version][2].

RB_ID=760532

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