Yueh-Hsuan Chiang b248e98cf9 Fix a destruction order issue in ThreadStatusUpdater
Summary:
Env holds a pointer of ThreadStatusUpdater, which will be deleted when
Env is deleted.  However, in case a rocksdb database is deleted after
Env is deleted.  Then this will introduce a free-after-use of this
ThreadStatusUpdater.

This patch fix this by never deleting the ThreadStatusUpdater in Env,
which is in general safe as Env is a singleton in most cases.

Test Plan: thread_list_test

Reviewers: andrewkr, sdong

Reviewed By: sdong

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D59187
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