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/cmd/vic-init/restart_test.go

@@ -0,0 +1,117 @@
+// Copyright 2016 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 main
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/vmware/vic/lib/config/executor"
+	"github.com/vmware/vic/lib/tether"
+	"github.com/vmware/vic/pkg/vsphere/extraconfig"
+)
+
+/////////////////////////////////////////////////////////////////////////////////////
+// TestPathLookup constructs the spec for a Session where the binary path must be
+// resolved from the PATH environment variable - this is a variation from normal
+// Cmd handling where that is done during creation of Cmd
+//
+
+func TestRestart(t *testing.T) {
+	testSetup(t)
+	defer testTeardown(t)
+
+	cfg := executor.ExecutorConfig{
+		ExecutorConfigCommon: executor.ExecutorConfigCommon{
+			ID:   "pathlookup",
+			Name: "tether_test_executor",
+		},
+		Diagnostics: executor.Diagnostics{
+			DebugLevel: 2,
+		},
+		Sessions: map[string]*executor.SessionConfig{
+			"pathlookup": {
+				Common: executor.Common{
+					ID:   "pathlookup",
+					Name: "tether_test_session",
+				},
+				Tty:    false,
+				Active: true,
+
+				Cmd: executor.Cmd{
+					// test relative path
+					Path: "date",
+					Args: []string{"date", "--reference=/"},
+					Env:  []string{"PATH=/bin"},
+					Dir:  "/bin",
+				},
+				Restart: true,
+			},
+		},
+	}
+
+	tthr, src := StartTether(t, &cfg)
+
+	// wait for initialization
+	<-Mocked.Started
+
+	result := &tether.ExecutorConfig{}
+	extraconfig.Decode(src, result)
+
+	// Started returns when we reload but that doesn't mean that the process is started
+	// Try multiple times before giving up
+	for i := 0; i < 10; i++ {
+		if result.Sessions["pathlookup"].Started != "" {
+			break
+		}
+		time.Sleep(time.Duration(i) * time.Millisecond)
+	}
+
+	assert.Equal(t, 0, result.Sessions["pathlookup"].ExitStatus, "Expected command to have exited cleanly")
+	assert.True(t, result.Sessions["pathlookup"].Restart, "Expected command to be configured for restart")
+
+	// wait for the resurrection count to max out the channel
+	for result.Sessions["pathlookup"].Diagnostics.ResurrectionCount < 10 {
+		result = &tether.ExecutorConfig{}
+		extraconfig.Decode(src, &result)
+		assert.Equal(t, 0, result.Sessions["pathlookup"].ExitStatus, "Expected command to have exited cleanly")
+		// proceed to the next reincarnation
+		<-Mocked.SessionExit
+		tthr.Reload()
+	}
+
+	// read the output from the session
+	log := Mocked.SessionLogBuffer.Bytes()
+
+	// the tether has to be stopped before comparison on the reaper may swaller exec.Wait
+	tthr.Stop()
+	<-Mocked.Cleaned
+
+	// run the command directly
+	out, err := exec.Command("/bin/date", "--reference=/").Output()
+	if err != nil {
+		fmt.Printf("Failed to run date for comparison data: %s", err)
+		t.Error(err)
+		return
+	}
+
+	assert.True(t, strings.HasPrefix(string(log), string(out)), "Expected the data to be constant - first invocation doesn't match")
+	assert.True(t, strings.HasSuffix(string(log), string(out)), "Expected the data to be constant - last invocation doesn't match")
+}