Improve the check for header guard

Summary:
cpplint.py only recognize `#ifdef HEADER_GUARD` as header guard.
This patch enables the check for `#pragma once`.

Test Plan: New arc lint exclude the false alarm for `#pragma once`.

Reviewers: dhruba, sdong, igor, haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16227
First Transaction Logs Should Not Skip Storage Options Given

Summary: Currently, the first transaction log file ignore bytes_per_sync and other storage-related options. It is not consistent. Fix it.

Test Plan: make all check. See the options set in GDB.

Reviewers: haobo, kailiu

Reviewed By: haobo

CC: igor, ljin, yhchiang, leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D16215
Disable putting filter block to block cache

Summary: This bug caused server crash issues because the filter block is too big and kept purging out of cache.

Test Plan: Wrote a new unit tests to make sure it works.

Reviewers: dhruba, haobo, igor, sdong

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16221
Add a test in prefix_test to verify correctness of results

Summary:
Add a test to verify HashLinkList and HashSkipList (mainly for the former one) returns the correct results when inserting the same bucket in the different orders.

Some other changes:
(1) add the test to test list
(2) fix compile error
(3) add header

Test Plan: ./prefix_test

Reviewers: haobo, kailiu

Reviewed By: haobo

CC: igor, yhchiang, i.am.jin.lei, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D16143