This commit updates the grpc server to accept connections on any
container IP and refresh the adapters README.md file.

Change-Id: Ic59c3b07d786499cda0a0a1a6be0ee1f75e869ca
diff --git a/common/grpc/server.go b/common/grpc/server.go
index 0441fcf..d5685f1 100644
--- a/common/grpc/server.go
+++ b/common/grpc/server.go
@@ -17,12 +17,11 @@
 
 import (
 	"context"
+	"fmt"
 	"github.com/opencord/voltha-go/common/log"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"net"
-	"strconv"
-	"strings"
 )
 
 /*
@@ -85,10 +84,8 @@
 Start prepares the GRPC server and starts servicing requests
 */
 func (s *GrpcServer) Start(ctx context.Context) {
-	host := strings.Join([]string{
-		s.address,
-		strconv.Itoa(int(s.port)),
-	}, ":")
+
+	host := fmt.Sprintf("%s:%d", s.address, s.port)
 
 	lis, err := net.Listen("tcp", host)
 	if err != nil {