Remove references to Atomikos and Bitronix

[dreis2211]

Hi,

given that both Atomikos and Bitronix support has been removed for a while now, I guess it's fair to remove the remaining references in the metadata.

Cheers,
Christoph

[snicoll]

Actually, I am not sure we should. This serves as hints for those upgrading. Atomikos was removed in 3.0 so it's way too soon to remove it. I think we should rather review the error deprecation that we have and decide when to remove it.

[dreis2211]

Ah fair. Bitronix was deprecated earlier. Atomikos might be a bit too early then. Whatever you decide here, I'm fine with it.

[wilkinsona]

We discussed this today and decided that one minor release at error level should be sufficient. For example, Bitronix was deprecated in 2.3. It remained in 2.4 while deprecated and was removed in 2.5. At that time its properties were moved to error level. Under this new policy they would have then be removed in 2.6. In short, we think we can remove the Bitronix metadata immediately (in 3.2).

Atomikos is a little different as it was removed in 3.0 without a period of deprecation as it was a new major. Regardless, we feel that a single minor release at error level is sufficient, particularly given that there are several other signals that the support has been removed such as the loss of the starter. We'll tidy this up in 3.2 as well.

[wilkinsona]

Thanks very much, @dreis2211.