on our 1.1.x branch, we use 0.2.17 of parent: good

Due to some reasons (e.g. much higher Keycloak version) we can not use 0.2.20, but I'd like to use Google's GCM drop on 1..1x as well for a few reasons:

* better updates and patches (from Google)

* back port of the GCM prio patch from Summers to 1.1.x

Here is the staging repo:

I'd like to release on Friday, if there no concerns...

-Matthias 

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