(VOL-4953)enabling retry codes in open-olt-adaptor

Enabling retry codes in open-olt-adaptor grpc-client so that it retries the grpc requests to the voltha-core
in case the core is unavailable or the request times out
(retry for pipeline)
Change-Id: Iae93e445ed6363b5fd654bdc1cbe3e53778b2a67
diff --git a/vendor/modules.txt b/vendor/modules.txt
index faaca9c..3b508e0 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -75,8 +75,10 @@
 # github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
 ## explicit
 github.com/grpc-ecosystem/go-grpc-middleware
+github.com/grpc-ecosystem/go-grpc-middleware/retry
 github.com/grpc-ecosystem/go-grpc-middleware/tags
 github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing
+github.com/grpc-ecosystem/go-grpc-middleware/util/backoffutils
 github.com/grpc-ecosystem/go-grpc-middleware/util/metautils
 # github.com/hashicorp/go-uuid v1.0.2
 github.com/hashicorp/go-uuid
@@ -135,7 +137,7 @@
 github.com/klauspost/compress/huff0
 github.com/klauspost/compress/zstd
 github.com/klauspost/compress/zstd/internal/xxhash
-# github.com/opencord/voltha-lib-go/v7 v7.4.1
+# github.com/opencord/voltha-lib-go/v7 v7.4.2
 ## explicit
 github.com/opencord/voltha-lib-go/v7/pkg/config
 github.com/opencord/voltha-lib-go/v7/pkg/db