Update keystone version to 18.1

Change-Id: I3ce790627d0a942f8df7c5b98a9afe078ffc41ab
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

docker/Keystone/Dockerfile

@@ -37,7 +37,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get dist-upgrade -y && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y \
     apache2=2.4.* \
-    keystone=2:18.0.* \
+    keystone=2:18.1.* \
     libapache2-mod-wsgi-py3=4.6.* \
     python3-pip=20.0.* \
     build-essential=12.8* \