[FAB-9839] Fix pending comments for purge CRs

This CR fixes a couple of minor comments that
were skipped in the original CRs for saving
efforts of rebasing etc.

Change-Id: I0c3f0838ea69fe14baabbcc167c5223c51f72df9
Signed-off-by: manish <manish.sethi@gmail.com>

core/ledger/kvledger/txmgmt/privacyenabledstate/db.go

@@ -186,6 +186,7 @@ func (p PvtUpdateBatch) ToCompositeKeyMap() map[PvtdataCompositeKey]*statedb.Ver
  return m
 }
 
+// String returns a print friendly form of HashedCompositeKey
 func (hck *HashedCompositeKey) String() string {
  return fmt.Sprintf("ns=%s, collection=%s, keyHash=%x", hck.Namespace, hck.CollectionName, hck.KeyHash)
 }

core/ledger/kvledger/txmgmt/privacyenabledstate/db_test.go

@@ -403,6 +403,8 @@ func TestCompositeKeyMap(t *testing.T) {
  testutil.AssertEquals(t, ok, true)
  _, ok = m[PvtdataCompositeKey{"ns2", "coll2", "key2"}]
  testutil.AssertEquals(t, ok, true)
+ _, ok = m[PvtdataCompositeKey{"ns2", "coll1", "key8888"}]
+ testutil.AssertEquals(t, ok, false)
 }
 
 func putPvtUpdates(t *testing.T, updates *UpdateBatch, ns, coll, key string, value []byte, ver *version.Height) {

core/ledger/pvtdatapolicy/btlpolicy.go

@@ -16,7 +16,7 @@ import (
  "github.com/hyperledger/fabric/protos/common"
 )
 
-var defaultBLT uint64 = math.MaxUint64
+var defaultBTL uint64 = math.MaxUint64
 
 // BTLPolicy BlockToLive policy for the pvt data
 type BTLPolicy interface {
@@ -70,7 +70,7 @@ func (p *LSCCBasedBTLPolicy) GetBTL(namesapce string, collection string) (uint64
  if btlConfigured > 0 {
  btl = uint64(btlConfigured)
  } else {
- btl = defaultBLT
+ btl = defaultBTL
  }
  p.cache[key] = btl
  }

core/ledger/pvtdatapolicy/btlpolicy_test.go

@@ -31,7 +31,7 @@ func TestBTLPolicy(t *testing.T) {
 
  btl3, err := btlPolicy.GetBTL("ns1", "coll3")
  assert.NoError(t, err)
- assert.Equal(t, defaultBLT, btl3)
+ assert.Equal(t, defaultBTL, btl3)
 
  _, err = btlPolicy.GetBTL("ns1", "coll4")
  _, ok := err.(privdata.NoSuchCollectionError)