Merging agelimits (#2)

* Added support for skipping ageLimits credential

* Make idin credential id configurable for testing

* Added user warning that attributes are going to be issued twice

* Improved text (feedback Bart)

* chore: Specify that the double issuance will end somewhere in 2020, and not necessarily a year after this change.
2 jobs for master in 49 seconds (queued for 14 minutes and 6 seconds)
Status Name Job ID Coverage
passed build-en #76944


passed build-nl #76945