Updated WildFly to 15.0

[ggam]

This updates WildFly to latest version, and removes the outdated Docker profile, which I don't think is useful anymore.

Tests will only pass with bundled profile enabled, but I also don't see the need to test the implementation bundled with the server (that will be covered by the TCK).

[ggam]

Fixes #231

[keilw]

Is Wildfly 15 still recent enough?

[darranl]

FYI I have some local changes to contribute to adjust the WildFly testing to make use of WildFly Galleon to dynamically provision the server being used for testing.

I have run into an issue I have fixed within the definitions within the layers within WildFly but this will not be available until WildFly 21 so I will continue my submission then.

Once using Galleon it will be possible to provision a server which contains the minimum functionality needed for the testing. Additionally we can provision both with and without our own EE security layer being present to allow for both the provided and bundled variants. At that point it should hopefully be fairly trivial to keep up to date with the latest WildFly versions.

[darranl]

For Jakarta EE 10 support we should move to WildFly 27 and combine with this issue so we provision a server instead of unzipping #276

By provisioning a server we will be able to selectively choose if we do or don't install EE Security allowing for the two different forms of testing.