Sagar Vemuri 7bb1f5d483 Increase of compaction threads should be logged at info level instead of a warning
Summary:
This log message shouldn't be a warning; some services are seeing high warning count due to this.

The count for the below line is a few hundreds of millions, as per Logview:
```
[rocksdb/src/db/column_family.cc:729] [checkpoints] Increasing compaction threads because we have 2 level-0 files
```
Closes https://github.com/facebook/rocksdb/pull/2364

Differential Revision: D5123565

Pulled By: sagar0

fbshipit-source-id: a07ce499a4f82f0ebde9cda9f4948fb9df6a734c
2017-05-26 09:56:13 -07:00
..
2017-04-27 18:06:12 -07:00
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2017-04-27 18:06:12 -07:00