An assorted collection of tweaks to thrift/compiler/test/compiler_test.py
An assorted collection of tweaks to thrift/compiler/test/compiler_test.py

Summary:
[Thrift] An assorted collection of tweaks to `thrift/compiler/test/compiler_test.py`.

Fixes for:
* Casing inconsistency.
* Unnecessary parens.
* Unnecessary subprocess call to `find`.
* Improperly re-raising an exception.

Reviewed By: eduardo-elizondo

Differential Revision: D4427765

fbshipit-source-id: a0bc17162f31f642de0eb2541348069ebd59b5f5

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