Print compression_size_percent as a signed int

Summary:
compression_size_percent is an int but was printed as
an unsigned int. So the default of -1 is displayed as a big number.

Test Plan: make check

Reviewers: sdong

Reviewed By: sdong

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D23679

util/options.cc

@@ -419,7 +419,7 @@ void ColumnFamilyOptions::Dump(Logger* log) const {
             "max_size_amplification_percent: %u",
         compaction_options_universal.max_size_amplification_percent);
     Log(log,
-        "Options.compaction_options_universal.compression_size_percent: %u",
+        "Options.compaction_options_universal.compression_size_percent: %d",
         compaction_options_universal.compression_size_percent);
     Log(log, "Options.compaction_options_fifo.max_table_files_size: %" PRIu64,
         compaction_options_fifo.max_table_files_size);