Produce a better error when iteration stops prematurely during put/create
Produce a better error when iteration stops prematurely during put/create

We now try to include the name of the child node that caused us to stop in
the error message.

kumy/augeas,mchf/augeas,dafugg/augeas,lutter/augeas,kumy/augeas,manandbytes/augeas,domcleal/augeas,GeoffWilliams/augeas,MikaelSmith/augeas,jjlin/augeas,kunkku/augeas,raphink/augeas,domcleal/augeas,jasperla/augeas,hercules-team/augeas-do-not-use,lutter/augeas,jasperla/augeas,ptoscano/augeas,dafugg/augeas,hercules-team/augeas-do-not-use,pevalme/augeas,mlichvar/augeas,lutter/augeas,ptoscano/augeas,kunkku/augeas,jjlin/augeas,mchf/augeas,kunkku/augeas,dafugg/augeas,raphink/augeas,kumy/augeas,pevalme/augeas,kumy/augeas,jtopjian/augeas,mlichvar/augeas,ptoscano/augeas,hercules-team/augeas,hercules-team/augeas-do-not-use,domcleal/augeas,jtopjian/augeas,GeoffWilliams/augeas,hercules-team/augeas,jjlin/augeas,MikaelSmith/augeas,mlichvar/augeas,pevalme/augeas,manandbytes/augeas