Fnlb/k8s grouper (#563)

* WIP: add k8s grouper

- This shares a great deal of behaviour with allGrouper. Once it's
tested, refactor that to share as much as possible

- Glide hell. Checked in the yaml and lock files but a glide i -v
will be required to bring vendor/ up-to-date. Will address once this
is ready.

* Update README. Make the watch tracking work.

(To follow: add the junk that was pulled in via the glide update.)

* Vendor updates.

* go fmt

* Use the allGrouper with a k8s-backed DBStore instead.

This is much tidier :-)

* Fix up go vet

vendor/github.com/ugorji/go/codec/helper_test.go

@@ -5,14 +5,171 @@ package codec
 
 // All non-std package dependencies related to testing live in this file,
 // so porting to different environment is easy (just update functions).
+//
+// This file sets up the variables used, including testInitFns.
+// Each file should add initialization that should be performed
+// after flags are parsed.
+//
+// init is a multi-step process:
+//   - setup vars (handled by init functions in each file)
+//   - parse flags
+//   - setup derived vars (handled by pre-init registered functions - registered in init function)
+//   - post init (handled by post-init registered functions - registered in init function)
+// This way, no one has to manage carefully control the initialization
+// using file names, etc.
+//
+// Tests which require external dependencies need the -tag=x parameter.
+// They should be run as:
+//    go test -tags=x -run=. <other parameters ...>
+// Benchmarks should also take this parameter, to include the sereal, xdr, etc.
+// To run against codecgen, etc, make sure you pass extra parameters.
+// Example usage:
+//    go test "-tags=x codecgen unsafe" -bench=. <other parameters ...>
+//
+// To fully test everything:
+//    go test -tags=x -benchtime=100ms -tv -bg -bi  -brw -bu -v -run=. -bench=.
+
+// Handling flags
+// codec_test.go will define a set of global flags for testing, including:
+//   - Use Reset
+//   - Use IO reader/writer (vs direct bytes)
+//   - Set Canonical
+//   - Set InternStrings
+//   - Use Symbols
+//
+// This way, we can test them all by running same set of tests with a different
+// set of flags.
+//
+// Following this, all the benchmarks will utilize flags set by codec_test.go
+// and will not redefine these "global" flags.
 
 import (
+	"bytes"
 	"errors"
+	"flag"
 	"fmt"
 	"reflect"
+	"sync"
 	"testing"
 )
 
+type testHED struct {
+	H Handle
+	E *Encoder
+	D *Decoder
+}
+
+var (
+	testNoopH    = NoopHandle(8)
+	testMsgpackH = &MsgpackHandle{}
+	testBincH    = &BincHandle{}
+	testSimpleH  = &SimpleHandle{}
+	testCborH    = &CborHandle{}
+	testJsonH    = &JsonHandle{}
+
+	testHandles     []Handle
+	testPreInitFns  []func()
+	testPostInitFns []func()
+
+	testOnce sync.Once
+
+	testHEDs []testHED
+)
+
+// variables used by tests
+var (
+	testVerbose        bool
+	testInitDebug      bool
+	testUseIoEncDec    bool
+	testStructToArray  bool
+	testCanonical      bool
+	testUseReset       bool
+	testWriteNoSymbols bool
+	testSkipIntf       bool
+	testInternStr      bool
+	testUseMust        bool
+	testCheckCircRef   bool
+	testJsonIndent     int
+)
+
+func init() {
+	testHEDs = make([]testHED, 0, 32)
+	testHandles = append(testHandles,
+		testNoopH, testMsgpackH, testBincH, testSimpleH,
+		testCborH, testJsonH)
+}
+
+func testHEDGet(h Handle) *testHED {
+	for i := range testHEDs {
+		v := &testHEDs[i]
+		if v.H == h {
+			return v
+		}
+	}
+	testHEDs = append(testHEDs, testHED{h, NewEncoder(nil, h), NewDecoder(nil, h)})
+	return &testHEDs[len(testHEDs)-1]
+}
+
+func testInitAll() {
+	flag.Parse()
+	for _, f := range testPreInitFns {
+		f()
+	}
+	for _, f := range testPostInitFns {
+		f()
+	}
+}
+
+func testCodecEncode(ts interface{}, bsIn []byte,
+	fn func([]byte) *bytes.Buffer, h Handle) (bs []byte, err error) {
+	// bs = make([]byte, 0, approxSize)
+	var e *Encoder
+	var buf *bytes.Buffer
+	if testUseReset {
+		e = testHEDGet(h).E
+	} else {
+		e = NewEncoder(nil, h)
+	}
+	if testUseIoEncDec {
+		buf = fn(bsIn)
+		e.Reset(buf)
+	} else {
+		bs = bsIn
+		e.ResetBytes(&bs)
+	}
+	if testUseMust {
+		e.MustEncode(ts)
+	} else {
+		err = e.Encode(ts)
+	}
+	if testUseIoEncDec {
+		bs = buf.Bytes()
+	}
+	return
+}
+
+func testCodecDecode(bs []byte, ts interface{}, h Handle) (err error) {
+	var d *Decoder
+	var buf *bytes.Reader
+	if testUseReset {
+		d = testHEDGet(h).D
+	} else {
+		d = NewDecoder(nil, h)
+	}
+	if testUseIoEncDec {
+		buf = bytes.NewReader(bs)
+		d.Reset(buf)
+	} else {
+		d.ResetBytes(bs)
+	}
+	if testUseMust {
+		d.MustDecode(ts)
+	} else {
+		err = d.Decode(ts)
+	}
+	return
+}
+
 // ----- functions below are used only by tests (not benchmarks)
 
 const (