DB Access Layer Merges: (sonic-net#96)

* DB Access Layer Merges:

* Numerous additions and fixes including:

* Unix domain sockets support.

* Check-And-Set (CAS) transaction cache coherence.

* DB Access/Time statistics, and per-connection cache.

* Go-Redis Options Configuration like ReadTimeout.

* GetEntries() (for redis pipelining) API implementation.

* Get() API for obtaining metadata.

* GetConfig() to get all tables in CONFIG_DB.

* Moved Table, and Value to their respective files.

    Co-authored-by: Sachin Holla <sachin.holla@broadcom.com>
    Co-authored-by: Mohammed Faraaz C <mohammed.faraaz@broadcom.com>
    Co-authored-by: Balachandar Mani <balachandar.mani@broadcom.com>

* DB Access Layer Merges: UT Fixes

* DB Access Layer Merge: UT Fixes - 2

translib/app_utils_test.go

@@ -152,7 +152,6 @@ func processDeleteRequest(url string) func(*testing.T) {
 func getConfigDb() *db.DB {
 	configDb, _ := db.NewDB(db.Options{
 		DBNo:               db.ConfigDB,
-		InitIndicator:      "CONFIG_DB_INITIALIZED",
 		TableNameSeparator: "|",
 		KeySeparator:       "|",
 	})