Use GerritForge fork of the nfs-server

The GerritForge's fork of nfs-server Docker image is built
also on arm64 and is published with a stable version.

See the GitHub repository at [1].

The advantages are the stability on arm64 and the ability
to have repeatable test environments.

[1] https://github.com/GerritForge/docker-nfs-server

Change-Id: I9e422b6f751d7d8bea7c64f66178a0f5e530f2cd
diff --git a/src/test/docker/nfs/Dockerfile b/src/test/docker/nfs/Dockerfile
index e4a8adc..c24ee9f 100644
--- a/src/test/docker/nfs/Dockerfile
+++ b/src/test/docker/nfs/Dockerfile
@@ -1,4 +1,4 @@
-FROM erichough/nfs-server
+FROM gerritforge/docker-nfs-server:3.11.3
 
 COPY exports.txt /etc/exports