VOL-1845 : Support for delete device in openolt adapter

           This commit is for the handling of delete device.

           The changes are done to handle the request for delete
           device. This includes the clearing of all data related
           to the device in KV store and reboot of device to reset
           the device.

           This commit has dependency in voltha-go so that needs to
           be merged first. Please refer this review link
           https://gerrit.opencord.org/#/c/15084/

           Updated to dep ensure above voltha-go patch set.  Also typo
           and make lint/sca fixes.

Change-Id: I53f16022c6902d498dad30e9b7d0ff50bf156347
diff --git a/vendor/go.etcd.io/etcd/raft/util.go b/vendor/go.etcd.io/etcd/raft/util.go
index c145d26..785cf73 100644
--- a/vendor/go.etcd.io/etcd/raft/util.go
+++ b/vendor/go.etcd.io/etcd/raft/util.go
@@ -17,6 +17,7 @@
 import (
 	"bytes"
 	"fmt"
+	"strings"
 
 	pb "go.etcd.io/etcd/raft/raftpb"
 )
@@ -25,13 +26,6 @@
 	return []byte(fmt.Sprintf("%q", st.String())), nil
 }
 
-// uint64Slice implements sort interface
-type uint64Slice []uint64
-
-func (p uint64Slice) Len() int           { return len(p) }
-func (p uint64Slice) Less(i, j int) bool { return p[i] < p[j] }
-func (p uint64Slice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
-
 func min(a, b uint64) uint64 {
 	if a > b {
 		return b
@@ -67,6 +61,69 @@
 	}
 }
 
+func DescribeHardState(hs pb.HardState) string {
+	var buf strings.Builder
+	fmt.Fprintf(&buf, "Term:%d", hs.Term)
+	if hs.Vote != 0 {
+		fmt.Fprintf(&buf, " Vote:%d", hs.Vote)
+	}
+	fmt.Fprintf(&buf, " Commit:%d", hs.Commit)
+	return buf.String()
+}
+
+func DescribeSoftState(ss SoftState) string {
+	return fmt.Sprintf("Lead:%d State:%s", ss.Lead, ss.RaftState)
+}
+
+func DescribeConfState(state pb.ConfState) string {
+	return fmt.Sprintf(
+		"Voters:%v VotersOutgoing:%v Learners:%v LearnersNext:%v AutoLeave:%v",
+		state.Voters, state.VotersOutgoing, state.Learners, state.LearnersNext, state.AutoLeave,
+	)
+}
+
+func DescribeSnapshot(snap pb.Snapshot) string {
+	m := snap.Metadata
+	return fmt.Sprintf("Index:%d Term:%d ConfState:%s", m.Index, m.Term, DescribeConfState(m.ConfState))
+}
+
+func DescribeReady(rd Ready, f EntryFormatter) string {
+	var buf strings.Builder
+	if rd.SoftState != nil {
+		fmt.Fprint(&buf, DescribeSoftState(*rd.SoftState))
+		buf.WriteByte('\n')
+	}
+	if !IsEmptyHardState(rd.HardState) {
+		fmt.Fprintf(&buf, "HardState %s", DescribeHardState(rd.HardState))
+		buf.WriteByte('\n')
+	}
+	if len(rd.ReadStates) > 0 {
+		fmt.Fprintf(&buf, "ReadStates %v\n", rd.ReadStates)
+	}
+	if len(rd.Entries) > 0 {
+		buf.WriteString("Entries:\n")
+		fmt.Fprint(&buf, DescribeEntries(rd.Entries, f))
+	}
+	if !IsEmptySnap(rd.Snapshot) {
+		fmt.Fprintf(&buf, "Snapshot %s\n", DescribeSnapshot(rd.Snapshot))
+	}
+	if len(rd.CommittedEntries) > 0 {
+		buf.WriteString("CommittedEntries:\n")
+		fmt.Fprint(&buf, DescribeEntries(rd.CommittedEntries, f))
+	}
+	if len(rd.Messages) > 0 {
+		buf.WriteString("Messages:\n")
+		for _, msg := range rd.Messages {
+			fmt.Fprint(&buf, DescribeMessage(msg, f))
+			buf.WriteByte('\n')
+		}
+	}
+	if buf.Len() > 0 {
+		return fmt.Sprintf("Ready MustSync=%t:\n%s", rd.MustSync, buf.String())
+	}
+	return "<empty Ready>"
+}
+
 // EntryFormatter can be implemented by the application to provide human-readable formatting
 // of entry data. Nil is a valid EntryFormatter and will use a default format.
 type EntryFormatter func([]byte) string
@@ -93,7 +150,7 @@
 		fmt.Fprintf(&buf, "]")
 	}
 	if !IsEmptySnap(m.Snapshot) {
-		fmt.Fprintf(&buf, " Snapshot:%v", m.Snapshot)
+		fmt.Fprintf(&buf, " Snapshot: %s", DescribeSnapshot(m.Snapshot))
 	}
 	return buf.String()
 }
@@ -107,13 +164,39 @@
 // DescribeEntry returns a concise human-readable description of an
 // Entry for debugging.
 func DescribeEntry(e pb.Entry, f EntryFormatter) string {
-	var formatted string
-	if e.Type == pb.EntryNormal && f != nil {
-		formatted = f(e.Data)
-	} else {
-		formatted = fmt.Sprintf("%q", e.Data)
+	if f == nil {
+		f = func(data []byte) string { return fmt.Sprintf("%q", data) }
 	}
-	return fmt.Sprintf("%d/%d %s %s", e.Term, e.Index, e.Type, formatted)
+
+	formatConfChange := func(cc pb.ConfChangeI) string {
+		// TODO(tbg): give the EntryFormatter a type argument so that it gets
+		// a chance to expose the Context.
+		return pb.ConfChangesToString(cc.AsV2().Changes)
+	}
+
+	var formatted string
+	switch e.Type {
+	case pb.EntryNormal:
+		formatted = f(e.Data)
+	case pb.EntryConfChange:
+		var cc pb.ConfChange
+		if err := cc.Unmarshal(e.Data); err != nil {
+			formatted = err.Error()
+		} else {
+			formatted = formatConfChange(cc)
+		}
+	case pb.EntryConfChangeV2:
+		var cc pb.ConfChangeV2
+		if err := cc.Unmarshal(e.Data); err != nil {
+			formatted = err.Error()
+		} else {
+			formatted = formatConfChange(cc)
+		}
+	}
+	if formatted != "" {
+		formatted = " " + formatted
+	}
+	return fmt.Sprintf("%d/%d %s%s", e.Term, e.Index, e.Type, formatted)
 }
 
 // DescribeEntries calls DescribeEntry for each Entry, adding a newline to
@@ -140,3 +223,11 @@
 	}
 	return ents[:limit]
 }
+
+func assertConfStatesEquivalent(l Logger, cs1, cs2 pb.ConfState) {
+	err := cs1.Equivalent(cs2)
+	if err == nil {
+		return
+	}
+	l.Panic(err)
+}