testutil/fakestorage: inline go code and remove contrib/httpserver

It's 12 lines of code total; we may as well write it as part of building;
it looks to be the only place this is used, so we can remove the contrib
directory, which should not be used by anyone.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

contrib/httpserver/Dockerfile

@@ -1,4 +0,0 @@
-FROM busybox
-EXPOSE 80/tcp
-COPY httpserver .
-CMD ["./httpserver"]

contrib/httpserver/server.go

@@ -1,12 +0,0 @@
-package main
-
-import (
-	"log"
-	"net/http"
-)
-
-func main() {
-	fs := http.FileServer(http.Dir("/static"))
-	http.Handle("/", fs)
-	log.Panic(http.ListenAndServe(":80", nil)) // #nosec G114 -- Ignoring for test-code: G114: Use of net/http serve function that has no support for setting timeouts (gosec)
-}