Session name suffix is ignored if cookie_domain is set

This sounds like a bug.

@cilefen Thanks for chiming in. I was not entirely sure about the category - but given I couldn't find anything in the code mentioning a deliberate choice to not include the suffix I'd agree by now - this was just forgotten and hence feels more like a bug.

I also found some possible related issues which could suffer from the same - or where files before the name suffix was added in the first place.
I've referenced them now.

Added tests fail without the new code and pass with the change.
I've decided to add an extra test case because I wasn't sure if it is advisable to adjust / extend the existing test: testEnforcedSessionNameViaCookieDomain

Can the MRs be cleaned up some. Just need 1 against 11.x