HBASE-25465 Use javac --release option for supporting cross version compilation in create-release

* Update our jdk11 build profile in the pom so that it uses the additional flag on javac, requires
  maven 3.6+.
* update create-release Dockerfile to use jdk11-headless

Author: ndimiduk

dev-support/create-release/hbase-rm/Dockerfile

@@ -34,13 +34,13 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get -qq -y update \
     libcurl4-openssl-dev='7.58.0-*' \
     libxml2-dev='2.9.4+dfsg1-*' \
     lsof='4.89+dfsg-*' \
-    openjdk-8-jdk='8u*' \
+    openjdk-11-jdk-headless='11*' \
     python-pip='9.0.1-*' \
     subversion='1.9.7-*' \
     wget='1.19.4-*' \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* \
-  && update-alternatives --set java /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java \
+  && update-alternatives --set java /usr/lib/jvm/java-11-openjdk-amd64/bin/java \
   && pip install \
     python-dateutil==2.8.1
 

pom.xml

@@ -1709,7 +1709,9 @@
       yyyy-MM-dd'T'HH:mm
     </maven.build.timestamp.format>
     <buildDate>${maven.build.timestamp}</buildDate>
+    <!-- these two control the Java language version and JVM runtime version supported -->
     <compileSource>1.8</compileSource>
+    <releaseTarget>8</releaseTarget>
     <!-- Build dependencies -->
     <maven.min.version>3.0.4</maven.min.version>
     <java.min.version>${compileSource}</java.min.version>
@@ -2702,6 +2704,7 @@
         <jdk>[1.11,)</jdk>
       </activation>
       <properties>
+        <maven.compiler.release>${releaseTarget}</maven.compiler.release>
         <!-- TODO: replicate logic for windows support -->
         <argLine>--add-opens=java.base/jdk.internal.ref=ALL-UNNAMED ${hbase-surefire.argLine}</argLine>
         <!-- We need a minimum HDFS version of 3.2.0 for HADOOP-12760 -->