Create new log file outside the dbmutex.
Summary: All filesystem Io should be done outside the dbmutex. There was one place when we have to roll the transaction log that we were creating the new log file while holding the dbmutex. I rearranged this code so that the act of creating the new transaction log file is done without holding the dbmutex. I also allocate the new memtable outside the dbmutex, this is important because creating the memtable could be heavyweight. Test Plan: make check and dbstress Reviewers: haobo, igor Reviewed By: haobo CC: leveldb, reconnect.grayhat Differential Revision: https://reviews.facebook.net/D14283
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