VMware vSphere Integrated Containers provider (#206)

* Add Virtual Kubelet provider for VIC

Initial virtual kubelet provider for VMware VIC.  This provider currently
handles creating and starting of a pod VM via the VIC portlayer and persona
server.  Image store handling via the VIC persona server.  This provider
currently requires the feature/wolfpack branch of VIC.

* Added pod stop and delete.  Also added node capacity.

Added the ability to stop and delete pod VMs via VIC.  Also retrieve
node capacity information from the VCH.

* Cleanup and readme file

Some file clean up and added a Readme.md markdown file for the VIC
provider.

* Cleaned up errors, added function comments, moved operation code

1. Cleaned up error handling.  Set standard for creating errors.
2. Added method prototype comments for all interface functions.
3. Moved PodCreator, PodStarter, PodStopper, and PodDeleter to a new folder.

* Add mocking code and unit tests for podcache, podcreator, and podstarter

Used the unit test framework used in VIC to handle assertions in the provider's
unit test.  Mocking code generated using OSS project mockery, which is compatible
with the testify assertion framework.

* Vendored packages for the VIC provider

Requires feature/wolfpack branch of VIC and a few specific commit sha of
projects used within VIC.

* Implementation of POD Stopper and Deleter unit tests (#4)

* Updated files for initial PR

vendor/github.com/vmware/vic/lib/migration/errors/errors.go

@@ -0,0 +1,75 @@
+// Copyright 2017 VMware, Inc. All Rights Reserved.
+//
+// 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 errors
+
+import (
+	"fmt"
+)
+
+// InternalError is returned when there is internal issue
+type InternalError struct {
+	Message string
+}
+
+func (e InternalError) Error() string {
+	return e.Message
+}
+
+type DataTypeError struct {
+	ExpectedType string
+}
+
+func (e DataTypeError) Error() string {
+	return fmt.Sprintf("Data type is not %s", e.ExpectedType)
+}
+
+type KeyNotFound struct {
+	Key     string
+	Message string
+}
+
+func (e KeyNotFound) Error() string {
+	return fmt.Sprintf("key %s is not found: %s", e.Key, e.Message)
+}
+
+type InvalidMigrationVersion struct {
+	Version string
+	Err     error
+}
+
+func (e InvalidMigrationVersion) Error() string {
+	return fmt.Sprintf("Data migration version is invalid %s: %s", e.Version, e.Err)
+}
+
+type DecodeError struct {
+	Err error
+}
+
+func (e DecodeError) Error() string {
+	if e.Err != nil {
+		return fmt.Sprintf("Failed to decode data: %s", e.Err)
+	}
+
+	return fmt.Sprintf("Failed to decode data")
+}
+
+type ValueFormatError struct {
+	Key   string
+	Value interface{}
+}
+
+func (e ValueFormatError) Error() string {
+	return fmt.Sprintf("Failed to convert value of key %s: %#v", e.Key, e.Value)
+}