extract label from id when summarising un[contained,managed]
extract label from id when summarising un[contained,managed]

I missed this in #2998.

weaveworks/scope,weaveworks/scope,weaveworks/scope,alban/scope,kinvolk/scope,weaveworks/scope,kinvolk/scope,kinvolk/scope,alban/scope,kinvolk/scope,alban/scope,kinvolk/scope,weaveworks/scope,weaveworks/scope,alban/scope,alban/scope,kinvolk/scope,alban/scope