fix-groups

[kevindorff]

This includes the content of the other existing PR, as those changes were necessary for me. That PR changed the version to 2.1.1, so I've versioned this one 2.1.2.

Additional changes in my code:

• This pulls the correct configuration key when obtaining the group patterns, httpservlet_transaction_namer.name_grouper.patterns. The existing code is using the obfuscation patterns key.
• This applies the parameter appending FIRST, so group patterns can use them.
• I simplified the logic of parameter appending to just append the parameters to URI as grouping will want this and I don't see a reason why it shouldn't go to obfuscation, too.

I believe this now works as intended. Please let me know if I've misunderstood the function of the method.

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