contrib/mixin: omit Defragment method from etcdGRPCRequestsSlow
contrib/mixin: omit Defragment method from etcdGRPCRequestsSlow

Signed-off-by: Sam Batschelet <eebdbe215779e06aa0285d26936ee9141aa3d260@redhat.com>

ajityagaty/etcd,mqliang/etcd,rnaveiras/etcd,etcd-io/etcd,rnaveiras/etcd,mqliang/etcd,ajityagaty/etcd,ajityagaty/etcd,rnaveiras/etcd,mqliang/etcd,mkumatag/etcd,gyuho/etcd,gyuho/etcd,mkumatag/etcd,mkumatag/etcd,etcd-io/etcd,etcd-io/etcd