gotest: exclude . files when parsing directories (per r's suggestion)
gotest: exclude . files when parsing directories (per r's suggestion)

R=r, rsc1, iant2
CC=golang-dev
http://codereview.appspot.com/4329044

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang