Use apiextension v1

- upgrade from apiextension v1beta1 to v1
 - generate yaml manifest for crd intead of applying it at runtime
  - users will have to apply the manifest with kubectl
 - kg and kgctl log an error if the crd is not present
 - now validation should actually work

Signed-off-by: leonnicolas <leonloechner@gmx.de>

vendor/github.com/gobuffalo/flect/singularize.go

@@ -0,0 +1,57 @@
+package flect
+
+import (
+	"strings"
+	"sync"
+)
+
+var singularMoot = &sync.RWMutex{}
+
+// Singularize returns a singular version of the string
+//	users = user
+//	data = datum
+//	people = person
+func Singularize(s string) string {
+	return New(s).Singularize().String()
+}
+
+// SingularizeWithSize will singular a string taking a number number into account.
+//	SingularizeWithSize("user", 1) = user
+//	SingularizeWithSize("user", 2) = users
+func SingularizeWithSize(s string, i int) string {
+	if i == 1 || i == -1 {
+		return New(s).Singularize().String()
+	}
+	return New(s).Pluralize().String()
+}
+
+// Singularize returns a singular version of the string
+//	users = user
+//	data = datum
+//	people = person
+func (i Ident) Singularize() Ident {
+	s := i.Original
+	if len(s) == 0 {
+		return i
+	}
+
+	singularMoot.RLock()
+	defer singularMoot.RUnlock()
+	ls := strings.ToLower(s)
+	if p, ok := pluralToSingle[ls]; ok {
+		return New(p)
+	}
+	if _, ok := singleToPlural[ls]; ok {
+		return i
+	}
+	for _, r := range singularRules {
+		if strings.HasSuffix(ls, r.suffix) {
+			return New(r.fn(s))
+		}
+	}
+
+	if strings.HasSuffix(s, "s") {
+		return New(s[:len(s)-1])
+	}
+	return i
+}