test: rewrite test/run shell script + errchk (perl) in Go
test: rewrite test/run shell script + errchk (perl) in Go

This doesn't run all ~750 of the tests, but most.

Progress on issue 2833

R=golang-dev, ality, rsc, r, r
CC=golang-dev
http://codereview.appspot.com/5625044

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