memoize isKnownServices for improved performance
memoize isKnownServices for improved performance

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