test: make goprint.go wait longer for go its routine to execute
test: make goprint.go wait longer for go its routine to execute

Update issue 5281

R=golang-dev, r, bradfitz, cshapiro
CC=golang-dev
https://codereview.appspot.com/8631047

tv42/old-go,pombredanne/go-deleteme,tv42/old-go,dsriram/golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,apparentlymart/golang,dsriram/golang,dsriram/golang,apparentlymart/golang,apparentlymart/golang,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,gnanderson/go,gnanderson/go,apparentlymart/golang,tv42/old-go,apparentlymart/golang,tv42/old-go,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang