Only print printable characters in tap.py
Only print printable characters in tap.py

Change-Id: Icfb14e5d61fbc1114c4b7e062e667a5e4642b927
Reviewed-on: http://review.northscale.com/964
Reviewed-by: Matt Ingenthron <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@northscale.com>
Tested-by: Matt Ingenthron <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@northscale.com>

daverigby/kv_engine,abhinavdangeti/ep-engine,sriganes/ep-engine,owendCB/ep-engine,sriganes/ep-engine,membase/ep-engine,abhinavdangeti/ep-engine,hisundar/ep-engine,zbase/ep-engine,daverigby/ep-engine,couchbaselabs/ep-engine,teligent-ru/ep-engine,jimwwalker/ep-engine,hisundar/ep-engine,sriganes/ep-engine,zbase/ep-engine,couchbase/ep-engine,teligent-ru/ep-engine,hisundar/ep-engine,couchbase/ep-engine,hisundar/ep-engine,membase/ep-engine,couchbase/ep-engine,zbase/ep-engine,zbase/ep-engine,daverigby/ep-engine,teligent-ru/ep-engine,teligent-ru/ep-engine,zbase/ep-engine,couchbaselabs/ep-engine,sriganes/ep-engine,owendCB/ep-engine,membase/ep-engine,daverigby/ep-engine,jimwwalker/ep-engine,couchbaselabs/ep-engine,couchbase/ep-engine,abhinavdangeti/ep-engine,jimwwalker/ep-engine,daverigby/kv_engine,abhinavdangeti/ep-engine,jimwwalker/ep-engine,couchbaselabs/ep-engine,owendCB/ep-engine,daverigby/kv_engine,owendCB/ep-engine,couchbaselabs/ep-engine,abhinavdangeti/ep-engine,membase/ep-engine,daverigby/ep-engine,daverigby/kv_engine