use HasGet() instead of Has() and Get() on fastcache lib

While getting a value, currently, we make two APIs calls
to the fastcache library. This can be avoided by making
a single call using the HasGet() API. This commit replaces
the two APIs call with a single HasGet() call.

Signed-off-by: senthil <[email protected]>

Author: cendhu

core/ledger/kvledger/txmgmt/statedb/statecouchdb/cache.go

@@ -63,11 +63,12 @@ func (c *cache) getState(chainID, namespace, key string) (*CacheValue, error) {
 
 	cacheKey := constructCacheKey(chainID, namespace, key)
 
-	if !cache.Has(cacheKey) {
+	valBytes, exist := cache.HasGet(nil, cacheKey)
+	if !exist {
 		return nil, nil
 	}
+
 	cacheValue := &CacheValue{}
-	valBytes := cache.Get(nil, cacheKey)
 	if err := proto.Unmarshal(valBytes, cacheValue); err != nil {
 		return nil, err
 	}