add concurrent unit test for LocalMessageBucketManager (EOFException found)
fix concurrency bug for LocalMessageBucketManager
Merge branch 'biz' of https://github.com/ainilife/cat into biz

Conflicts:
	cat-core/src/test/java/com/dianping/cat/storage/dump/LocalMessageBucketManagerTest.java
Merge pull request #211 from ainilife/biz

add concurrent unit tests