Moving Some includes from options.h to forward declaration

Summary: By removing some includes form options.h and reply on forward declaration, we can more easily reason the dependencies.

Test Plan: make all check

Reviewers: kailiu, haobo, igor, dhruba

Reviewed By: kailiu

CC: leveldb

Differential Revision: https://reviews.facebook.net/D15411

util/coding.h

@@ -16,6 +16,8 @@
 #include <stdint.h>
 #include <string.h>
 #include <string>
+
+#include "rocksdb/write_batch.h"
 #include "port/port.h"
 
 namespace rocksdb {