In-memory environment read beyond EOF
Summary: Made it consistent with posix Env, which uses pread() that returns 0 (success) when an offset is given beyond EOF. The purpose of making these Envs behave consistently is I am repurposing the in-memory Envs' tests for the basic Env tests in D58635. Test Plan: ran mock_env_test and memenv_test Reviewers: IslamAbdelRahman, lightmark, sdong Reviewed By: sdong Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D58845
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