Delete redundant server stream tests
Delete redundant server stream tests

Summary: These tests are from early in the implementation before we had nice testing facilities, and are exactly duplicated by the much cleaner StreamServiceTest - Basic case which is instantiated with both ServerStream flavors

Reviewed By: bithree

Differential Revision: D22068223

fbshipit-source-id: f05cd62997f900f36cc1a6be17830bcfff863a9f

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