default workloads using uniform?

[xxxuuu]

Why this submission replace zipfian with uniform?
6f16ad8

This seems inconsistent with comments and YCSB repositories:

go-ycsb/workloads/workloada

Lines 17 to 36 in 515fd00

	# Yahoo! Cloud System Benchmark
	# Workload A: Update heavy workload
	# Application example: Session store recording recent actions
	#
	# Read/update ratio: 50/50
	# Default data size: 1 KB records (10 fields, 100 bytes each, plus key)
	# Request distribution: zipfian
	recordcount=1000
	operationcount=1000
	workload=core
	readallfields=true
	readproportion=0.5
	updateproportion=0.5
	scanproportion=0
	insertproportion=0
	requestdistribution=uniform