gohbase: merge zkLookup and zkLookupSync function
gohbase: merge zkLookup and zkLookupSync function

It's  unnecessary to separate them since it's a common golang pattern.

Change-Id: I2a1296a68e62a6db00cc3c939282f64764c7c13b

tsuna/gohbase,dougklein/gohbase,dougklein/gohbase