Add new examples to kompose (#1803)

#### What type of PR is this?

<!--
Add one of the following kinds:
/kind bug
/kind documentation
/kind feature
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/kind cleanup

#### What this PR does / why we need it:

Fixes the current broken examples by:

* Removing all the old incompatible ones (we do not really support v3
  anymore or v2... since switching libraries)
* Uses quay.io/kompose/web as our front end example which is a fork of
  the guestbook-go kubernetes examples

#### Which issue(s) this PR fixes:
<!--
*Automatically closes linked issue when PR is merged.
Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
-->

Closes https://github.com/kubernetes/kompose/issues/1757

#### Special notes for your reviewer:

Test using docker-compose (you'll see it come up!), then try with
kompose :)

Signed-off-by: Charlie Drage <charlie@charliedrage.com>

examples/web/vendor/github.com/xyproto/pinterface/pinterface.go

@@ -0,0 +1,161 @@
+// Package pinterface provides interface types for the xyproto/simple* and xyproto/permission* packages
+package pinterface
+
+import "net/http"
+
+// Version is the API version. The API is stable within the same major version number
+const Version = 5.3
+
+// Database interfaces
+
+type IList interface {
+	Add(value string) error
+	All() ([]string, error)
+	Clear() error
+	LastN(n int) ([]string, error)
+	Last() (string, error)
+	Remove() error
+}
+
+type ISet interface {
+	Add(value string) error
+	All() ([]string, error)
+	Clear() error
+	Del(value string) error
+	Has(value string) (bool, error)
+	Remove() error
+}
+
+type IHashMap interface {
+	All() ([]string, error)
+	Clear() error
+	DelKey(owner, key string) error
+	Del(key string) error
+	Exists(owner string) (bool, error)
+	Get(owner, key string) (string, error)
+	Has(owner, key string) (bool, error)
+	Keys(owner string) ([]string, error)
+	Remove() error
+	Set(owner, key, value string) error
+}
+
+type IHashMap2 interface {
+	All() ([]string, error)
+	AllWhere(key, value string) ([]string, error)
+	Clear() error
+	Count() (int64, error)
+	DelKey(owner, key string) error
+	Del(key string) error
+	Empty() (bool, error)
+	Exists(owner string) (bool, error)
+	GetMap(owner string, keys []string) (map[string]string, error)
+	Get(owner, key string) (string, error)
+	Has(owner, key string) (bool, error)
+	Keys(owner string) ([]string, error)
+	Remove() error
+	SetLargeMap(all map[string]map[string]string) error
+	SetMap(owner string, m map[string]string) error
+	Set(owner, key, value string) error
+}
+
+type IKeyValue interface {
+	Clear() error
+	Del(key string) error
+	Get(key string) (string, error)
+	Inc(key string) (string, error)
+	Remove() error
+	Set(key, value string) error
+}
+
+// Interface for making it possible to depend on different versions of the permission package,
+// or other packages that implement userstates.
+type IUserState interface {
+	AddUnconfirmed(username, confirmationCode string)
+	AddUser(username, password, email string)
+	AdminRights(req *http.Request) bool
+	AllUnconfirmedUsernames() ([]string, error)
+	AllUsernames() ([]string, error)
+	AlreadyHasConfirmationCode(confirmationCode string) bool
+	BooleanField(username, fieldname string) bool
+	ClearCookie(w http.ResponseWriter)
+	ConfirmationCode(username string) (string, error)
+	ConfirmUserByConfirmationCode(confirmationcode string) error
+	Confirm(username string)
+	CookieSecret() string
+	CookieTimeout(username string) int64
+	CorrectPassword(username, password string) bool
+	Email(username string) (string, error)
+	FindUserByConfirmationCode(confirmationcode string) (string, error)
+	GenerateUniqueConfirmationCode() (string, error)
+	HashPassword(username, password string) string
+	HasUser(username string) bool
+	IsAdmin(username string) bool
+	IsConfirmed(username string) bool
+	IsLoggedIn(username string) bool
+	Login(w http.ResponseWriter, username string) error
+	Logout(username string)
+	MarkConfirmed(username string)
+	PasswordAlgo() string
+	PasswordHash(username string) (string, error)
+	RemoveAdminStatus(username string)
+	RemoveUnconfirmed(username string)
+	RemoveUser(username string)
+	SetAdminStatus(username string)
+	SetBooleanField(username, fieldname string, val bool)
+	SetCookieSecret(cookieSecret string)
+	SetCookieTimeout(cookieTime int64)
+	SetLoggedIn(username string)
+	SetLoggedOut(username string)
+	SetMinimumConfirmationCodeLength(length int)
+	SetPasswordAlgo(algorithm string) error
+	SetPassword(username, password string)
+	SetUsernameCookie(w http.ResponseWriter, username string) error
+	UsernameCookie(req *http.Request) (string, error)
+	Username(req *http.Request) string
+	UserRights(req *http.Request) bool
+
+	Creator() ICreator
+	Host() IHost
+	Users() IHashMap
+}
+
+// Data structure creator
+type ICreator interface {
+	NewHashMap(id string) (IHashMap, error)
+	NewKeyValue(id string) (IKeyValue, error)
+	NewList(id string) (IList, error)
+	NewSet(id string) (ISet, error)
+}
+
+// Database host (or file)
+type IHost interface {
+	Close()
+	Ping() error
+}
+
+// Redis host (implemented structures can also be an IHost, of course)
+type IRedisHost interface {
+	DatabaseIndex()
+	Pool()
+}
+
+// Redis data structure creator
+type IRedisCreator interface {
+	SelectDatabase(dbindex int)
+}
+
+// Middleware for permissions
+type IPermissions interface {
+	AddAdminPath(prefix string)
+	AddPublicPath(prefix string)
+	AddUserPath(prefix string)
+	Clear()
+	DenyFunction() http.HandlerFunc
+	Rejected(w http.ResponseWriter, req *http.Request) bool
+	ServeHTTP(w http.ResponseWriter, req *http.Request, next http.HandlerFunc)
+	SetAdminPath(pathPrefixes []string)
+	SetDenyFunction(f http.HandlerFunc)
+	SetPublicPath(pathPrefixes []string)
+	SetUserPath(pathPrefixes []string)
+	UserState() IUserState
+}