Siying Dong 4e37251b4d With ldb --try_load_options and wal_dir doesn't exist, ignore it (#4875)
Summary:
LDB is frequently used to exam data copied. wal_dir in option file is not modified and it usually points to the path it copied from.
The user experience will be better if when ldb sees wal_dir pointed by the option file doesn't exist, rather than fail, just ignore it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4875

Differential Revision: D13643173

Pulled By: siying

fbshipit-source-id: 2e64d4ea2ec49a6794b9a706b7fc1ba901128bb8
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