#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/README.md b/README.md
index af83cbd..b59a027 100644
--- a/README.md
+++ b/README.md
@@ -29,16 +29,16 @@
 --------
 Running GlassFish QuickLook tests:
 
-`mvn -f appserver/tests/quicklook/pom.xml test -Dglassfish.home=appserver/distributions/glassfish/target/stage/glassfish5/glassfish`
+`mvn -f appserver/tests/quicklook/pom.xml test -Dglassfish.home=appserver/distributions/glassfish/target/stage/glassfish6/glassfish`
 
 For more details, see [QuickLook_Test_Instructions](https://github.com/eclipse-ee4j/glassfish/blob/master/appserver/tests/quicklook/QuickLook_Test_Instructions.html)
 
 Starting GlassFish
 ------------------
 
-`glassfish5/bin/asadmin start-domain`
+`glassfish6/bin/asadmin start-domain`
 
 Stopping GlassFish
 ------------------
 
-`glassfish5/bin/asadmin stop-domain`
+`glassfish6/bin/asadmin stop-domain`