Run RHAMT on JDK 11

related PR to start from: https://github.com/windup/windup/pull/1321 --> Forge/Furnace dependencies have been updated there.

we need to be able to run on JDK11 and 8.

• web console / openshift: upgrade jboss modules
• core: upgrade janusgraph to 0.3.0 (on the PR its a snapshot version, but it's likely it will be available in maven central soon, at least the sources are released according to github)
• from a quick test on JDK10 byte-buddy (we inherit it from ferma) needs to be updated too, as the version we are using (1.7.5) doesn't know java10 and above: https://github.com/raphw/byte-buddy/issues/370

trial and error from there.