remove system validators package from kubeadm and use k8s.io/system-validators instead

Signed-off-by: Yassine TIJANI <ytijani@vmware.com>

vendor/k8s.io/system-validators/validators/validators.go

@@ -0,0 +1,75 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package system
+
+import (
+	"fmt"
+)
+
+// Validator is the interface for all validators.
+type Validator interface {
+	// Name is the name of the validator.
+	Name() string
+	// Validate is the validate function.
+	Validate(SysSpec) ([]error, []error)
+}
+
+// Reporter is the interface for the reporters for the validators.
+type Reporter interface {
+	// Report reports the results of the system verification
+	Report(string, string, ValidationResultType) error
+}
+
+// Validate uses validators to validate the system and returns a warning or error.
+func Validate(spec SysSpec, validators []Validator) ([]error, []error) {
+	var errs []error
+	var warns []error
+
+	for _, v := range validators {
+		fmt.Printf("Validating %s...\n", v.Name())
+		warn, err := v.Validate(spec)
+		if len(err) != 0 {
+			errs = append(errs, err...)
+		}
+		if len(warn) != 0 {
+			warns = append(warns, warn...)
+		}
+	}
+	return warns, errs
+}
+
+// ValidateSpec uses all default validators to validate the system and writes to stdout.
+func ValidateSpec(spec SysSpec, runtime string) ([]error, []error) {
+	// OS-level validators.
+	var osValidators = []Validator{
+		&OSValidator{Reporter: DefaultReporter},
+		&KernelValidator{Reporter: DefaultReporter},
+		&CgroupsValidator{Reporter: DefaultReporter},
+		&packageValidator{reporter: DefaultReporter},
+	}
+	// Docker-specific validators.
+	var dockerValidators = []Validator{
+		&DockerValidator{Reporter: DefaultReporter},
+	}
+
+	validators := osValidators
+	switch runtime {
+	case "docker":
+		validators = append(validators, dockerValidators...)
+	}
+	return Validate(spec, validators)
+}