Update to OpenJDK 12 ea22 (#8618)

Motivation:

We should use the latest OpenJDK 12 release when running tests against Java12.

Modifications:

- Update to OpenJDK 12 ea22.
- Update pax exam version
- skip OSGI testsuite on Java12 as it does not work ea22 yet.

Result:

Use latest OpenJDK 12 version when running on the CI.

docker/docker-compose.centos-6.112.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "6"
-        java_version : "openjdk@1.12.0-19"
+        java_version : "openjdk@1.12.0-22"
 
   test:
     image: netty:centos-6-1.12

docker/docker-compose.centos-7.112.yaml

@@ -7,7 +7,7 @@ services:
     build:
       args:
         centos_version : "7"
-        java_version : "openjdk@1.12.0-19"
+        java_version : "openjdk@1.12.0-22"
 
   test:
     image: netty:centos-7-1.12

pom.xml

@@ -85,6 +85,8 @@
         <!-- This is the minimum supported by Java12 -->
         <maven.compiler.source>1.7</maven.compiler.source>
         <maven.compiler.target>1.7</maven.compiler.target>
+        <!-- pax-exam does not work on latest Java12 EA 22 build -->
+        <skipOsgiTestsuite>true</skipOsgiTestsuite>
       </properties>
     </profile>
 

testsuite-osgi/pom.xml

@@ -29,7 +29,7 @@
   <name>Netty/Testsuite/OSGI</name>
 
   <properties>
-    <exam.version>4.9.1</exam.version>
+    <exam.version>4.13.0</exam.version>
     <argLine.java9.extras>--add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.security=ALL-UNNAMED</argLine.java9.extras>
   </properties>