fix(client_test): add comment about the trailing slash
fix(client_test): add comment about the trailing slash

giantswarm/go-etcd,barakmich/go-etcd,kmchen/go-etcd,shafreeck/go-etcd,pengzj/go-etcd,wangyumi/go-etcd,coreos/go-etcd,nordligulv/go-etcd,Yhgenomics/go-etcd,stormltf/go-etcd,mbrukman/go-etcd,zenoss/go-etcd,mischief/go-etcd,pquerna/go-etcd