[VOL-4514]  Addressing device reconciliation failure

This commit consists of augmention the current GetHeathStatus()
API on the grpc server with the grpc client information.  This
provides the grpc server with more insights of the grpc client
connection status.  This is useful for a server to know whether it
is more likely to receive a response following a request from a
remote server, represented by the grpc client(s).  For now this is
used by the openonu adapter to figure out when it can send an
OMCI request to the openolt adapter following a restart of the
onu adapter.

Change-Id: I0c117c0002b83606b95d7269e6f53d21941e4ba5
diff --git a/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
index 0d5a811..20852e5 100644
--- a/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
+++ b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
@@ -37,7 +37,17 @@
 	if target.Authority != "" {
 		return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.Authority)
 	}
-	addr := resolver.Address{Addr: target.Endpoint}
+
+	// gRPC was parsing the dial target manually before PR #4817, and we
+	// switched to using url.Parse() in that PR. To avoid breaking existing
+	// resolver implementations we ended up stripping the leading "/" from the
+	// endpoint. This obviously does not work for the "unix" scheme. Hence we
+	// end up using the parsed URL instead.
+	endpoint := target.URL.Path
+	if endpoint == "" {
+		endpoint = target.URL.Opaque
+	}
+	addr := resolver.Address{Addr: endpoint}
 	if b.scheme == unixAbstractScheme {
 		// prepend "\x00" to address for unix-abstract
 		addr.Addr = "\x00" + addr.Addr