test.py: failures due to repository change for juju dependencies

[hmlanigan]

heather@ubuntu-maverick:~/work/src/gopkg.in/goose$ ./test.py --verbose
Could not find "src/gopkg.in/goose.v1" in cwd: /home/heather/work/src/gopkg.in/goose
Unable to automatically set GOPATH
Running: go fmt ./...
Running: go build ./...
testservices/cmd/main.go:9:2: cannot find package "launchpad.net/gnuflag" in any of:
/usr/lib/go-1.6/src/launchpad.net/gnuflag (from $GOROOT)
/home/heather/work/src/launchpad.net/gnuflag (from $GOPATH)
FAIL: failed running: go build ./...

Per https://launchpad.net/gnuflag: "NOTE: The official location of this package has now moved to https://github.com/juju/gnuflag ."

heather@ubuntu-maverick:~/work/src/github.com/juju/juju$ find $GOPATH -name gnuflag
/home/heather/work/src/github.com/lxc/lxd/shared/gnuflag
/home/heather/work/src/github.com/juju/gnuflag

I'm running Xenial and juju 2.0-beta18-xenial-amd64

[hmlanigan]

The update to test.py was landed in:
#30