HDDS-1018. Update the base image of krb5 container for the secure ozone cluster. Contributed by Xiaoyu Yao.

hadoop-ozone/dist/src/main/compose/ozonesecure/docker-image/docker-krb5/Dockerfile-krb5

@@ -15,7 +15,7 @@
 # limitations under the License.
 
 
-FROM frolvlad/alpine-oraclejdk8:slim
+FROM openjdk:8u191-jdk-alpine3.9
 RUN apk add --update bash ca-certificates openssl krb5-server krb5 && rm -rf /var/cache/apk/* && update-ca-certificates
 RUN wget -O /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64
 RUN chmod +x /usr/local/bin/dumb-init