upload/koji: add helpers to upload to koji

This does not yet actually upload the image, and it only supports empty
images. You need to place a an empty file named <filename>, with a valid
extension (e.g., .qcow2) in /mnt/koji/work/<directory>/.

Signed-off-by: Tom Gundersen <teg@jklm.no>

vendor/github.com/kolo/xmlrpc/README.md

@@ -0,0 +1,89 @@
+[![GoDoc](https://godoc.org/github.com/kolo/xmlrpc?status.svg)](https://godoc.org/github.com/kolo/xmlrpc)
+
+## Overview
+
+xmlrpc is an implementation of client side part of XMLRPC protocol in Go language.
+
+## Status
+
+This project is in minimal maintenance mode with no further development. Bug fixes
+are accepted, but it might take some time until they will be merged.
+
+## Installation
+
+To install xmlrpc package run `go get github.com/kolo/xmlrpc`. To use
+it in application add `"github.com/kolo/xmlrpc"` string to `import`
+statement.
+
+## Usage
+
+    client, _ := xmlrpc.NewClient("https://bugzilla.mozilla.org/xmlrpc.cgi", nil)
+    result := struct{
+      Version string `xmlrpc:"version"`
+    }{}
+    client.Call("Bugzilla.version", nil, &result)
+    fmt.Printf("Version: %s\n", result.Version) // Version: 4.2.7+
+
+Second argument of NewClient function is an object that implements
+[http.RoundTripper](http://golang.org/pkg/net/http/#RoundTripper)
+interface, it can be used to get more control over connection options.
+By default it initialized by http.DefaultTransport object.
+
+### Arguments encoding
+
+xmlrpc package supports encoding of native Go data types to method
+arguments.
+
+Data types encoding rules:
+
+* int, int8, int16, int32, int64 encoded to int;
+* float32, float64 encoded to double;
+* bool encoded to boolean;
+* string encoded to string;
+* time.Time encoded to datetime.iso8601;
+* xmlrpc.Base64 encoded to base64;
+* slice encoded to array;
+
+Structs decoded to struct by following rules:
+
+* all public field become struct members;
+* field name become member name;
+* if field has xmlrpc tag, its value become member name.
+
+Server method can accept few arguments, to handle this case there is
+special approach to handle slice of empty interfaces (`[]interface{}`).
+Each value of such slice encoded as separate argument.
+
+### Result decoding
+
+Result of remote function is decoded to native Go data type.
+
+Data types decoding rules:
+
+* int, i4 decoded to int, int8, int16, int32, int64;
+* double decoded to float32, float64;
+* boolean decoded to bool;
+* string decoded to string;
+* array decoded to slice;
+* structs decoded following the rules described in previous section;
+* datetime.iso8601 decoded as time.Time data type;
+* base64 decoded to string.
+
+## Implementation details
+
+xmlrpc package contains clientCodec type, that implements [rpc.ClientCodec](http://golang.org/pkg/net/rpc/#ClientCodec)
+interface of [net/rpc](http://golang.org/pkg/net/rpc) package.
+
+xmlrpc package works over HTTP protocol, but some internal functions
+and data type were made public to make it easier to create another
+implementation of xmlrpc that works over another protocol. To encode
+request body there is EncodeMethodCall function. To decode server
+response Response data type can be used.
+
+## Contribution
+
+See [project status](#status).
+
+## Authors
+
+Dmitry Maksimov (dmtmax@gmail.com)