Fix bug in Logger creation if dbname and db_log_dir are on different filesystem ...

Fix bug in Logger creation if dbname and db_log_dir are on different filesystem (#10292)

Summary:
If dbname and db_log_dir are at different filesystems (one
local and one remote), creation of dbname will fail because that path
doesn't exist wrt to db_log_dir.
This patch will ignore the error returned on creation of dbname. If they
are on same filesystem, db_log_dir creation will automatically return
the error in case there is any error in creation of dbname.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10292

Test Plan: Existing unit tests

Reviewed By: riversand963

Differential Revision: D37567773

Pulled By: akankshamahajan15

fbshipit-source-id: 005d28c536208d4c126c8cb8e196d1d85b881100