#22874 Updated version in pom files to 6.0.0-SNAPSHOT

* Updated properties for glassfish-version.properties to 6 and 0.
* Updated copyright to 2020 in files touched.
* Updated Jenkinsfile and readme

Signed-off-by: arjantijms arjan.tijms@gmail.com
diff --git a/Jenkinsfile b/Jenkinsfile
index 20d0976..751846e 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -200,7 +200,7 @@
     }
   }
   environment {
-    S1AS_HOME = "${WORKSPACE}/glassfish5/glassfish"
+    S1AS_HOME = "${WORKSPACE}/glassfish6/glassfish"
     APS_HOME = "${WORKSPACE}/appserver/tests/appserv-tests"
     TEST_RUN_LOG = "${WORKSPACE}/tests-run.log"
     GF_INTERNAL_ENV = credentials('gf-internal-env')