Zhongyi Xie e8480d4d9d add assert to silence clang analyzer and fix variable shadowing (#5140)
Summary:
This PR address two open issues:

1.  clang analyzer is paranoid about db_ being nullptr after DB::Open calls in the test.
See https://github.com/facebook/rocksdb/pull/5043#discussion_r271394579
Add an assert to keep clang happy
2. PR https://github.com/facebook/rocksdb/pull/5049 introduced a  variable shadowing:
```
db/db_iterator_test.cc: In constructor ‘rocksdb::DBIteratorWithReadCallbackTest_ReadCallback_Test::TestBody()::TestReadCallback::TestReadCallback(rocksdb::SequenceNumber)’:
db/db_iterator_test.cc:2484:9: error: declaration of ‘max_visible_seq’ shadows a member of 'this' [-Werror=shadow]
         : ReadCallback(max_visible_seq) {}
         ^
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5140

Differential Revision: D14735497

Pulled By: miasantreble

fbshipit-source-id: 3219ea75cf4ae04f64d889323f6779e84be98144
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