Balazs asked me to clean up the 5 YANG modules in this commit:

"My main complaint is, that they botched the containment mapping, have managed to insert some leafs directly under the ManagedElement list. Sadly, I found other problems too. Not running -3gpp on the YAMs. Doing some extra complicated mapping of some attributes."

I fixed all the issues except the injection of leafs directly under ManagedElement and elsewhere. We need to discuss how to do that in a 3GPP friendly way. This commit contains fixes for R17 only. This work may need to be backported to R16 as well.

Pyang is clean on these modules now:
$ pyang --3gpp _3gpp-nr-nrm-cesmanagementfunction.yang
$ pyang --3gpp _3gpp-nr-nrm-dpciconfigurationfunction.yang
$ pyang --3gpp _3gpp-nr-nrm-desmanagementfunction.yang
$ pyang --3gpp _3gpp-nr-nrm-dmrofunction.yang
$ pyang --3gpp _3gpp-nr-nrm-drachoptimizationfunction.yang
$