[core] Fix #380 by working around recorder/logger initialization timing. #381
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The HdrHistogramReader makes some problematic assumptions on the roles played by start time, base time and histogram start/end times. This is to be revisited in a future release of HdrHistogram (see HdrHistogram/HdrHistogram#69). In the meantime this change will make YCSB record as expected by the current reader:
a. Set histogram log base time (same as start time)
b. Only create the recorder after the log has been setup