Update gerrit docker image to java 11

Gerrit 3.2 supports java 11 now and Gerrit 3.3 will be the last to
support java 8. Lets get ahead of things and switch to java 11.

Change-Id: I1b2f6b1bdadad10917ef5c56ce77f7d7cfc8625d

docker/gerrit/base/Dockerfile

@@ -18,7 +18,7 @@ FROM docker.io/opendevorg/python-builder:3.7 as builder
 COPY . /tmp/src
 RUN assemble
 
-FROM docker.io/library/openjdk:8 as gerrit-base
+FROM docker.io/library/openjdk:11 as gerrit-base
 
 RUN echo 'APT::Install-Recommends "0";' > /etc/apt/apt.conf.d/95disable-recommends
 
@@ -69,4 +69,4 @@ ENV JAVA_OPTIONS ""
 # Ulimits should be set on command line or in docker-compose.yaml
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 # The /dev/./urandom is not a typo. https://stackoverflow.com/questions/58991966/what-java-security-egd-option-is-for
-CMD /usr/local/openjdk-8/bin/java -Djava.security.egd=file:/dev/./urandom ${JAVA_OPTIONS} -jar /var/gerrit/bin/gerrit.war daemon -d /var/gerrit
+CMD /usr/local/openjdk-11/bin/java -Djava.security.egd=file:/dev/./urandom ${JAVA_OPTIONS} -jar /var/gerrit/bin/gerrit.war daemon -d /var/gerrit

playbooks/roles/gerrit/templates/gerrit.config.j2

@@ -27,7 +27,7 @@
 {% if gerrit_heap_limit is defined %}
 	heapLimit = {{ gerrit_heap_limit }}
 {% endif %}
-	javaHome = /usr/local/openjdk-8/jre
+	javaHome = /usr/local/openjdk-11/jre
 	javaOptions = "-Dflogger.backend_factory=com.google.common.flogger.backend.log4j.Log4jBackendFactory#getInstance"
 	javaOptions = "-Dflogger.logging_context=com.google.gerrit.server.logging.LoggingContext#getInstance"
 [gc]

playbooks/zuul/gerrit/repos.yaml

@@ -1,6 +1,7 @@
 - hosts: all
   roles:
-    - ensure-java
+    - role: ensure-java
+      java_version: 11
     - role: ensure-nodejs
       node_version: 10
     - ensure-bazelisk