Move deps from _workspace/ to vendor/

godep restore
pushd $GOPATH/src/github.com/appc/spec
git co master
popd
go get go4.org/errorutil
rm -rf Godeps
godep save ./...
git add vendor
git add -f $(git ls-files --other vendor/)
git co -- Godeps/LICENSES Godeps/.license_file_state Godeps/OWNERS

vendor/github.com/coreos/pkg/timeutil/backoff.go

@@ -0,0 +1,15 @@
+package timeutil
+
+import (
+	"time"
+)
+
+func ExpBackoff(prev, max time.Duration) time.Duration {
+	if prev == 0 {
+		return time.Second
+	}
+	if prev > max/2 {
+		return max
+	}
+	return 2 * prev
+}