remove coverage script from sources

coverage

@@ -1,40 +0,0 @@
-#!/bin/sh
-#
-# this file is from:
-# https://raw.githubusercontent.com/mlafeldt/chef-runner/v0.7.0/script/coverage
-# it is covered by the Apache License v2.0
-# modified for our purpose
-#
-# Generate test coverage statistics for Go packages.
-#
-# Works around the fact that `go test -coverprofile` currently does not work
-# with multiple packages, see https://code.google.com/p/go/issues/detail?id=6909
-#
-# Usage: script/coverage
-#
-
-#set -e
-
-workdir=.cover
-profile="$workdir/cover.out"
-mode=count
-
-generate_cover_data() {
-    echo "Cleaning"
-    rm -rf "$workdir"
-    mkdir "$workdir"
-
-    for pkg in "$@"; do
-        echo $pkg
-        f="$workdir/$(echo $pkg | tr / -).cover"
-        go test -covermode="$mode" -coverprofile="$f" "$pkg"
-    done
-
-    echo "Building coverfile"
-    echo "mode: $mode" >"$profile"
-    grep -h -v "^mode:" "$workdir"/*.cover >>"$profile"
-}
-
-generate_cover_data $(go list ./...)
-echo "Showing report"
-go tool cover -html="$profile"